Remove BOARD_VOLD_EMMC_SHARES_DEV_MAJOR option

 * Our external sdcard is separated from internal storage.
 * Also lower max partitions as we only have 24 available.

Change-Id: Ie20511b340ae2669ed50578f4e66709d7439f298
Remove obsolete BLUETOOTH_HCI_USE_MCT

Change-Id: Ic602d559ca74c1f1025342a91d0e22efea40c0c4