drm/dp: DRM DP helper for reading Ignore MSA from DPCD

DP sink device sets the Ignore MSA bit in its
DP_DOWNSTREAM_PORT_COUNT register to indicate its ability to
ignore the MSA video timing parameters and its ability to support
seamless video timing change over a range of timing exposed by
DisplayID and EDID.
This is required for the sink to indicate that it is Adaptive sync
capable.

v3:
* Fi the typo in commit message (Manasi)
v2:
* Rename to describe what the function does (Jani Nikula)

Cc: Jani Nikula <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Cc: Harry Wentland <[email protected]>
Cc: Nicholas Kazlauskas <[email protected]>
Signed-off-by: Manasi Navare <[email protected]>
Reviewed-by: Harry Wentland <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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