drm/radeon/kms: add accessors for RCU indirect space

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index 0f89ce3..9009dd4 100644
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -3120,10 +3120,8 @@
 		u32 efuse_straps_4;
 		u32 efuse_straps_3;
 
-		WREG32(RCU_IND_INDEX, 0x204);
-		efuse_straps_4 = RREG32(RCU_IND_DATA);
-		WREG32(RCU_IND_INDEX, 0x203);
-		efuse_straps_3 = RREG32(RCU_IND_DATA);
+		efuse_straps_4 = RREG32_RCU(0x204);
+		efuse_straps_3 = RREG32_RCU(0x203);
 		tmp = (((efuse_straps_4 & 0xf) << 4) |
 		      ((efuse_straps_3 & 0xf0000000) >> 28));
 	} else {