drm/i915/dp: Decode dsc max delta bpp from sink dpcd

Add intel_dp_dsc_max_delta_bppx16() to parse sink dsc max
delta bpp from dpcd when DP_DSC_MAX_BPP_DELTA_AVAILABILITY
is set. This helper decodes the delta range for both RGB/YCbCr444
and YCbCr420 formats from DP_DSC_MAX_BPP_DELTA.

With this addition, the flow becomes:
1. First, check for a format-specific range and use it to calculate
max compressed bpp.
2. If not, check for sink supported max compressed bpp and
use that
3. If this is also not there go with mandatory
max range supported bpp.

v2: Reorder the check flow for max_bpp. [Ankit]
v3: Put RGB and YCbCr444 mask assignment in the same line. [Ankit]
v4: Zero max_bpp for reserved RGB/YCbCr444 delta values. [sashiko]

Signed-off-by: Nemesa Garg <nemesa.garg@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://patch.msgid.link/20260623094236.1586318-5-nemesa.garg@intel.com

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