toolchain: ARM: Fix toolchain compilation for gcc 8.x

toolchain: ARM: Fix toolchain compilation for gcc 8.x

Set the toolchain's ARM CPU and FPU architectures by utilizing' gcc's
--with-cpu / --with-fpu configure options that: "Specify which cpu
variant the compiler should generate code for by default. cpu will
be used as the default value of the -mcpu= switch."

This will resolve the following kernel compilation failures under
gcc 8.x on ARM because the kernel wants to set (possibly conflicting)
optimization flags.

.../ccyVnmrs.s:204: Error: selected processor does not support `dmb ish' in ARM mode
.../ccyVnmrs.s:215: Error: architectural extension `mp' is not allowed for the current base architecture
.../ccyVnmrs.s:216: Error: selected processor does not support `pldw [r4]' in ARM mode

Because this is a big change, the .config and toolchain need to be
refreshed (as in removed and regenerated).

Reported-by: Ansuel Smith <[email protected]>
Reported-by: Daniel Engberg <[email protected]> [#1203]
Signed-off-by: Boris Krasnovskiy <[email protected]>
Signed-off-by: Christian Lamparter <[email protected]> [extended commit message,
removed now-deprecated CPU_CFLAGS, changed author to gmail address]