Some 32bits guest OS can use the CNTP timer, however KVM does not
handle the accesses, injecting a fault instead.

Use the proper handlers to emulate the EL1 Physical Timer (CNTP)
register accesses of AArch32 guests.
Signed-off-by: NJérémy Fanguède <j.fanguede@virtualopensystems.com>
Signed-off-by: NAlvise Rigo <a.rigo@virtualopensystems.com>
Signed-off-by: NChristoffer Dall <christoffer.dall@linaro.org>