drm/dp: complete the implementation for remote dpcd read
Current DP MST topology layer has incomplete implementation
for drm_dp_send_dpcd_read function. This change completes
the implementation in order to make it ready for exporting
the function to the dp mst drivers.
Change-Id: I59ce468d0353dab54b37bee7d6917d15cad16020
Signed-off-by:
Govinda Rajulu Chenna <gchenna@codeaurora.org>
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