ARM: dts: msm: Update the timer clock frequency for msmskunk RUMI

Timer runs at 1 MHz on the RUMI and not 19.2 MHz. Update the RUMI dts
files to use supported timer frequency.

CRs-Fixed: 1056457
Change-Id: I59a31a76a8db4a70fbd931e2e308fad7a759137e
Signed-off-by: Channagoud Kadabi <ckadabi@codeaurora.org>