odroid-c4-hardkernel: Switch back to cortexa55 defaulttune
odroid-c4-hardkernel: Switch back to cortexa55 defaulttune

meta-arm has since dropped arm-8.3 toolchain and we have also removed
dependency on it already

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

akuster/meta-odroid,akuster/meta-odroid,akuster/meta-odroid,akuster/meta-odroid