fix: increase TSRAM of `fvp-tspd-tbb-mbedtls-tsp-dram-no-cohmem`

This build job is currently failing due to a lack of available Trusted
SRAM.

Signed-off-by: Chris Kay <chris.kay@arm.com>
Change-Id: Id617ccdd38399ac5eaf0e715cae00bdc27fb6fce
1 file changed