Add MLX support for draft model #7858

Job	Run time
test-qnn / test-backend-linux (qnn, operators) / linux-job	15m 20s
test-qnn / test-backend-linux (qnn, models) / linux-job	27m 53s
test-qnn / test-backend-macos	-6s
test-qnn / package-golden-artifacts	2m 22s
	45m 29s

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