fstab.skate: don't hardcode fs type, don't install as recovery.fstab

Use separate recovery.fstab in msm7x27-common for recovery to
fix sdcard partitioning.

Change-Id: I2aaa1eb29f42c9a3be467a586f7be1060db24a2a

Conflicts:
	BoardConfig.mk
	fstab.p500