arm/dt: msm8610: Add DT property for timer reset during PC

On 8610, the timers get reset during Power collapse. The idle core
should migrate the timers into a broadcast timer to be able to wakeup
from sleep. Low power code uses this flag to determine if timer keeps
its state.

Change-Id: Icc26e34bc89522aba65aaf80fab09eac4ba9c1d2
Signed-off-by: Priyanka Mathur <pmathur@codeaurora.org>