feat(fvp): increase BL1_RW and BL2 size

feat(fvp): increase BL1_RW and BL2 size

To support mbedtls3.3 increase BL1_RW and BL2 size rsa+ecdsa alg.

Increase both by one page size. In mbedtls3.3 numerous config options
have been tweaked and made defaults[1] thus a small increase in size
can result for mbedtls-3.3

This size limitation is observed when we build TF-A with
TF_MBEDTLS_KEY_ALG=rsa+ecdsa this approach is used in juno as well,
so use similar approach for FVP.

[1]: https://github.com/Mbed-TLS/mbedtls/blob/development/docs/3.0-migration-guide.md

Change-Id: I8a423711ac50b3d615c1d9650086cdbca5051c8e
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>