[ARM] arm32: Cleanups and consmetic changes.

Large part of cpu_vcpu_cp15.c was violating 80 col text limit
and "arm_priv(vcpu)->cp15" was extensively used. Also cp15
register save/restore was in one unified switch function which
results in duplicate checks on "vcpu->is_normal".

The cpu_vcpu_vfp.c has issues similar to cpu_vcpu_cp15.c as
described above.

This patch does cleanups to fix the above.

Signed-off-by: Anup Patel <anup@brainfault.org>