libril: Merge xmm6262 and xmm6260 to single lib.

The difference between two libs are very minor,
includes one hack around ucsInfo and the logic
to adjust signal strength. Besides that other
diffs are some logs.

The new version of code is minaly based on xmm6262,
especially the logic to adjust singal strength.

Merge them to easy maintain the code.
libril: move samsung specific into seperate table

SAMSUNG sol request and unsol repsonse are moved into
seperate header file. This elimate hard-coded number about table
offset.

Also add some samsung vendor commands which is found from
n7100 device tree.