drm/i915/dsc: Add slice_row_per_frame in DSC PPS programming

Add the newly added slice_row_per_frame parameter
in the Picture Parameter Set registers.
This defines the number of vertically stacked slices
in a frame.

Credits to Manasi for noticing bSpec change.
Suggested-by: Manasi Navare <manasi.d.navare@intel.com>
Cc: Manasi Navare <manasi.d.navare@intel.com>
Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181031001923.31442-1-manasi.d.navare@intel.com

drivers/gpu/drm/i915/i915_reg.h

@@ -10977,6 +10977,7 @@ enum skl_power_gate {
 #define ICL_DSC1_PICTURE_PARAMETER_SET_16(pipe)	_MMIO_PIPE((pipe) - PIPE_B, \
 							   _ICL_DSC1_PICTURE_PARAMETER_SET_16_PB, \
 							   _ICL_DSC1_PICTURE_PARAMETER_SET_16_PC)
+#define  DSC_SLICE_ROW_PER_FRAME(slice_row_per_frame)	((slice_row_per_frame) << 20)
 #define  DSC_SLICE_PER_LINE(slice_per_line)		((slice_per_line) << 16)
 #define  DSC_SLICE_CHUNK_SIZE(slice_chunk_size)		((slice_chunk_size) << 0)