Remove re-initialisation of system timers after warm boot for FVP

This patch removes the reinitialisation of memory mapped system timer
registers after a warm boot for the FVP. The system timers in FVP are
in the 'Always ON' power domain which meant the reinitialisation was
redundant and it could have conflicted with the setup the normal
world has done.

The programming of CNTACR(x) and CNTNSAR, the system timer registers,
are removed from the warm boot path with this patch.

Fixes ARM-software/tf-issues#169

Change-Id: Ie982eb03d1836b15ef3cf1568de2ea68a08b443e
Merge pull request #135 from soby-mathew/sm/remove-reinit-of-timers

Remove re-initialisation of system timers after warm boot for FVP