Readjust BL2 size after sharing Mbed TLS heap
Readjust BL2 size after sharing Mbed TLS heap

After introducing the Mbed TLS shared heap optimisation, reducing BL2
size by 3 pages didn't leave enough space for growth. We give 1 page
back to maximum BL2 size.

Change-Id: I4f05432f00b923693160f69a4e4ec310a37a2b16
Signed-off-by: John Tsichritzis <c5e6a94b5ed6b01ab911c6a4e005fdf814669fe4@arm.com>

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