arch/arm/Kconfig: enable unaligned capability for ARM

Change-Id: I3efa02f681833632d3983b9bcd256fd4e1e3732c
Signed-off-by: faux123 <reioux@gmail.com>
Signed-off-by: ptmr3 <ptmr323@gmail.com>
cpufreq: Manage only online cpus