ARM: dts: msm: Add 19.2Mhz clock plan support to cci_clk_src

Current minimum clock is at 50MHz, update the clock to support
CCI requirements, update the cci node with 19.2MHz clock.

Change-Id: I3699d106e58b04b2e4ef4216233d671645f5c351
Signed-off-by: Viswanadha Raju Thotakura <viswanad@codeaurora.org>