msm7627_surf: Fix key mapping issues for surf & ffa

Target failed to enter fastboot mode due to key
mapping differences between surf & ffa. Device enters
to recovery mode when "B" is pressed on FFA instead
of fastboot. Add key layout for ffa and initialize
keypad based on machine ID to fix the issue.

CRs-Fixed: 296976

Change-Id: Idc79dc8cf4550406a39b80f1015776ca3f6bdaca
1 file changed