raspberrypi3-64.conf: Use more appropriate tune
raspberrypi3-64.conf: Use more appropriate tune

rpi3 is based on cortex-a53 implementation which is armv8+crc+simd
now that OE-Core has the appropriate tunes, switch to using the new
tune file, bonus, is that chromium will be more optimized now

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

schnitzeltony/meta-raspi-light,schnitzeltony/meta-raspi-light