Arm backend: Fix Ethos-U setup patch application #7001

Job	Run time
test-vulkan / test-backend-linux (vulkan, models) / linux-job	21m 41s
test-vulkan / test-backend-linux (vulkan, operators) / linux-job	21m 59s
test-vulkan / test-backend-macos	-1s
test-vulkan / package-golden-artifacts	3m 43s
	47m 22s

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