Refactor out mac_sign_setup and mac_verify_setup
Refactor out mac_sign_setup and mac_verify_setup

Since they became equivalent after moving the is_sign checking back to
the PSA core, they're now redundant, and the generic mac_setup function
can just be called directly.

Signed-off-by: Steven Cooreman <3aba90f1d379733e8874f60494a9cbe19be366cb@silabs.com>

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