ARM: dts: msm: Update Initial power level for 8909w GPU

8909w GPU supports only one clock level i.e. 200MHz.
Hence update the initial power level also to run at the same clock.

Change-Id: Ifd7144c0888b87eaf2c93707aa12d196823da441
Signed-off-by: Rajesh Kemisetti <rajeshk@codeaurora.org>