drm/radeon: don't reset dma on NI/SI init

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

bug:
https://www.libreoffice.org/bugzilla/show_bug.cgi?id=83500

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

drivers/gpu/drm/radeon/ni_dma.c

···
 	u32 reg_offset, wb_offset;
 	int i, r;
 
-	/* Reset dma */
-	WREG32(SRBM_SOFT_RESET, SOFT_RESET_DMA | SOFT_RESET_DMA1);
-	RREG32(SRBM_SOFT_RESET);
-	udelay(50);
-	WREG32(SRBM_SOFT_RESET, 0);
-
 	for (i = 0; i < 2; i++) {
 		if (i == 0) {
 			ring = &rdev->ring[R600_RING_TYPE_DMA_INDEX];