Add cpu type checking for aarch64 in sattypes.h file
Add cpu type checking for aarch64 in sattypes.h file

To avoid the warning message while compiling on aarch64 machines, this
patch adds STRESSAPPTEST_CPU_AARCH64 support in CPU type checking to
sattypes.h file

Signed-off-by: Wei Huang <8fa8838ab83387ae867845f542b9fe9ca04873f0@redhat.com>

stressapptest/stressapptest,stressapptest/stressapptest,stressapptest/stressapptest