aarch64-tc: Fix cortexa72-cortexa53 reference
require conf/multilib.conf
-require conf/machine/include/tune-cortexa72-cortexa53.inc
+require conf/machine/include/arm/armv8a/tune-cortexa72-cortexa53.inc
require conf/machine/include/baremetal-tc.conf
# Define ilp32 variant (not in tune files)
