fix(fvp): increase BL2 size for CRYPTO_SUPPORT & ROMLIB

With MbedTLS v2.28.5 and using GCC 11.3, there is a compilation error
for the config fvp-tbb-mbedtls-romlib-fwu:
BL2 image has exceeded its limit.
region `RAM' overflowed by 4096 bytes
Increase the size of BL2 by 4kB: use the same size for (CRYPTO_SUPPORT &&
USE_ROMLIB) as for (TRUSTED_BOARD_BOOT && COT_DESC_IN_DTB). In this case
BL31 is not supposed to increase, and then won't break other configs like
fvp-tspd-tbb-mbedtls-dualroot

Signed-off-by: Yann Gautier <yann.gautier@st.com>
Change-Id: Iea791f6b2c7ace7e376e7dbd6a90dd3bcefd799b
1 file changed