arm-bsp/trusted-firmware-a: Update SHA for tc0

This SHA of trusted-firmware-a includes support for
additional features for tc0 including TZC and cpuidle.

Change-Id: I004f9614b2bada9b88d2fce90f0f10064d8437e4
Signed-off-by: Usama Arif <usama.arif@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>