fdts: tc0: Add node for mmc
fdts: tc0: Add node for mmc

The pl180 mmc uses 3.3V fixed regulator and vexpress
sysreg for card detection and write protect.

Change-Id: I2513cfcb97217e282a081a700f3a9f723e8207ff
Signed-off-by: Usama Arif <2c149411f3e2627c4e078c64c194672b53885363@arm.com>

achingupta/arm-trusted-firmware,achingupta/arm-trusted-firmware