mshci: disable MMC_CAP_ERASE on u1

Change-Id: I89d868bd380924b012ef33fca51301b0dcb556a0
Merge "mshci: disable MMC_CAP_ERASE on u1" into cm-10.1
reduce undervolting to -50mV per step for cpu and gpu
Keep up with upstream
defconfig: bump to r2