ls1088a: Add VID support for QDS and RDB platforms

ls1088a: Add VID support for QDS and RDB platforms

This patch adds the support for VID on LS1088AQDS and LS1088ARDB systems.
It reads the fusesr register and changes the VDD accordingly by adjusting
the voltage via LTC3882 regulator.

This patch also takes care of the special case of 0.9V VDD is present in
fusesr register. In that case,it also changes the SERDES voltage by
disabling the SERDES, changing the SVDD and then re-enabling SERDES.

Signed-off-by: Raghav Dogra <[email protected]>
Signed-off-by: Ashish Kumar <[email protected]>
Signed-off-by: Amrita Kumari <[email protected]>
Signed-off-by: Rajesh Bhagat <[email protected]>
Reviewed-by: York Sun <[email protected]>