drm/msm/dp: update parsing of AUX configuration settings

Extend the parsing logic for AUX settings by adding multiple settings
per configuration and parsing the register offsets. This enables the
extension to support different targets, and combinations of AUX
controller settings depending on the use case.

Change-Id: I4e6b623a4d9fafcfcc89477dfa57880eb798c350
Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>