raspberrypi4-64: Switch to using cortexa72-crc default tune
raspberrypi4-64: Switch to using cortexa72-crc default tune

rpi4 SOC does not have AES Crypto in H/W

Fixes Issue #964

Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>

agherzan/meta-raspberrypi,agherzan/meta-raspberrypi,agherzan/meta-raspberrypi,agherzan/meta-raspberrypi,agherzan/meta-raspberrypi,agherzan/meta-raspberrypi