drm/amdgpu/uvd4: fix mask and shift definitions

A few define's are listed twice with different, incorrect values.
This fix sets them appropriately.
Signed-off-by: Remington Brasga <rbrasga@uci.edu>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/include/asic_reg/uvd/uvd_4_0_sh_mask.h

@@ -340,8 +340,6 @@
 #define UVD_LMI_CTRL__REQ_MODE_MASK 0x00000200L
 #define UVD_LMI_CTRL__REQ_MODE__SHIFT 0x00000009
 #define UVD_LMI_CTRL__RFU_MASK 0xf8000000L
-#define UVD_LMI_CTRL__RFU_MASK 0xfc000000L
-#define UVD_LMI_CTRL__RFU__SHIFT 0x0000001a
 #define UVD_LMI_CTRL__RFU__SHIFT 0x0000001b
 #define UVD_LMI_CTRL__VCPU_DATA_COHERENCY_EN_MASK 0x00200000L
 #define UVD_LMI_CTRL__VCPU_DATA_COHERENCY_EN__SHIFT 0x00000015