clocksource: arch_timer: Do not disble CNTVCT useraccess for 32-bit

This reverts commit 94b2ae99 ("arm: traps: emulate
a MRRC instruction reading CNTVCT register"). This
change is not required for msm-3.18 and causes some
userspace regression. So, drop it.

Change-Id: Ie1a22756c9b07668cb884c1dfaed18bcf8ca50e4
Signed-off-by: Rajeswari Konda <rajkonda@codeaurora.org>
Signed-off-by: Neeraj Upadhyay <neeraju@codeaurora.org>