drm/i915/vdsc: Check slice design requirement

Add function to check if slice design requirements are being
met as defined in Bspec: 49259 in the section
Slice Design Requirement

--v7
-remove full bspec link [Jani]
-rename intel_dsc_check_slice_design_req to
intel_dsc_slice_dimensions_valid [Jani]

--v8
-fix condition to check if slice width and height are
of two
-fix minimum pixel in slice condition

--v10
-condition should be < rather then >= [Uma]

Cc: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230309062855.393087-7-suraj.kandpal@intel.com