SM8750: add rumble/haptics support for AYN Odin 3

[simper]

Summary

Adds force feedback / rumble support for the AYN Odin 3 (SM8750) using the Qualcomm PMIH0108 HV haptics driver, bridged to the rsinput gamepad driver so rumble events from games reach the LRA vibration motor.

This brings feature parity with SM8550 (Odin 2 / RP6), which already has haptics support merged via #2519.

Background

Armada OS issue #16 ("Enable rumble support") was closed as completed for SM8550 devices, but Odin 3 (SM8750) remains without rumble — the ROCKNIX SM8750 branch only has the base rsinput driver without FF support, and no haptics driver at all.

Gianni Spadoni (@gio3k) wrote experimental haptics patches in his initial Odin 3 PR #2613, but the haptics commits were not carried forward when that PR was partially merged. This PR resurrects and adapts that work.

Changes

File	Description
1000-input-misc-qcom-hv-haptics-sm8750.patch	Qualcomm HV haptics driver from OnePlus SM8750 Android kernel (qcom-hv-haptics.c, 6736 lines). Implements FF_CONSTANT and FF_PERIODIC/FF_CUSTOM FIFO streaming for the PMIH0108 LRA actuator. Exports qcom_spmi_haptics_global_{upload,playback,set_gain} for cross-driver access.
1001-haptics-driver-support-periodic-sine-and-fixes.patch	Adds FF_SINE waveform handling, usleep_range to udelay fixes for atomic context, and gain-during-playback logic.
1002-input-rsinput-sm8750-ff.patch	Rewritten to match the current rsinput driver in next (Philippe Simons' rewrite). Adds FF_PERIODIC capability + input_ff_create() to the rsinput gamepad, with upload/playback callbacks that forward events to the haptics driver via its exported API. Includes rumble_enable module param for runtime control.
1003-arm64-dts-qcom-ayn-cq8725s-common-hv-haptics.patch	Adds the pmih0108_hv_haptics node to cq8725s-ayn-common.dtsi with SDAM config, LRA parameters, and 6 effect + 9 primitive waveform definitions from AYN's downstream DTS.
linux.aarch64.conf	Enable CONFIG_INPUT_QCOM_HV_HAPTICS=m

How it works

Game -> Steam/Proton -> InputPlumber virtual gamepad
     -> FF event routed back to rsinput source device
     -> rsinput_rumble_play() calls qcom_spmi_haptics_global_playback()
     -> PMIH0108 HV haptics driver drives the LRA motor

Testing

Not yet tested on hardware. I don't have an Odin 3. This PR is based on:

• @gio3k's original experimental patches (from commit cab1d7f in PR SM8750: Add support for the Ayn Odin 3 and SM8750 platform #2613)
• The same driver approach proven on SM8550 by @r3claimer (Add initial haptics support for SM8550 Ayn and Retroid Devices #2519, merged)

If you have an Odin 3, please test and report back. Build the SM8750 image from this branch, flash, and try rumble in games or fftest /dev/input/event*.

Credits

• Gianni Spadoni (@gio3k) -- original experimental rumble and haptics patches for Odin 3 (PR SM8750: Add support for the Ayn Odin 3 and SM8750 platform #2613, commit cab1d7f)
• @r3claimer -- the SM8550 haptics implementation (PR Add initial haptics support for SM8550 Ayn and Retroid Devices #2519) that proved this approach works
• OnePlus / Qualcomm -- the downstream qcom-hv-haptics.c driver source

AI Usage

AI was used to: research the gap, extract/adapt patches from the original fork, and rewrite the rsinput FF bridge patch to match the current next rsinput driver. The actual driver code is from Qualcomm/OnePlus downstream.