fix: increase TSRAM of 'fvp-tbb-mbedtls-bl2-el3'

This build job is currently failing the errata framework
based cpu conversion patches due to lack of available
SRAM.

Signed-off-by: Sona Mathew <SonaRebecca.Mathew@arm.com>
Change-Id: Ied03ad8dc5ecdf1f84f91ae737122176042800f0
(cherry picked from commit 40e5be98b3e227d74d0a26b2827f96c0b97de8c0)
2 files changed