ARM: dts: msm: Add clock rate property for clk_div node for pm6150

Add "assigned-clocks" and "assigned-clock-rates" properties to
the div_clk node to get the required div_clk output frequency
for the pm6150/pm6150l PMICs.

Change-Id: I33c186db99f39519bb8d2c73f9c99b667ec5aef4
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>