Revert "Don't trim MPIs to minimal size in mbedtls_mpi_mul_mpi()"
Revert "Don't trim MPIs to minimal size in mbedtls_mpi_mul_mpi()"

This reverts commit 808e666eeef4097ddf22618c0f54f37953033441.

Signed-off-by: Hanno Becker <4d488caff78d6184f59bbe6e137e34d4606b9fe8@arm.com>

ARMmbed/mbedtls,Mbed-TLS/mbedtls,Mbed-TLS/mbedtls,ARMmbed/mbedtls,Mbed-TLS/mbedtls,ARMmbed/mbedtls,Mbed-TLS/mbedtls,ARMmbed/mbedtls