Build: Fix Cortex-M23 build failure in GCC >= 8.0

Cortex-M23 doesn't support '+nofp' feature option in GCC >= 8.0.
Specify the CPU list which support '+nofp' and other CPUs are not added
with '+nofp'.

Change-Id: Ie6d42256415ac96e868ffb8e5bf639f0c1028bcb
Signed-off-by: David Hu <david.hu@arm.com>
1 file changed