drm/radeon: don't reset sdma on CIK init

Otherwise we may lose the DMA golden settings which can
lead to hangs, etc.

Reviewed-by: Christian König <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>
Cc: [e-mail]

drivers/gpu/drm/radeon/cik_sdma.c

···
 {
 	int r;
 
-	/* Reset dma */
-	WREG32(SRBM_SOFT_RESET, SOFT_RESET_SDMA | SOFT_RESET_SDMA1);
-	RREG32(SRBM_SOFT_RESET);
-	udelay(50);
-	WREG32(SRBM_SOFT_RESET, 0);
-	RREG32(SRBM_SOFT_RESET);
-
 	r = cik_sdma_load_microcode(rdev);
 	if (r)
 		return r;