ARM: dts: msm: vote for BB_CLK1 for ref clock src for msmtitanium

On msmtitanium, USB driver is required to vote BB_CLK1 for ref clock
src for USB PHYs as ln_bb_clk is used for different purpose. Hence
update the same in USB device node for msmtitanium. Also vote for
regulator S7 for vdd supply for QUSB PHY.

Change-Id: Ib2b1fa39b180c1755607485b655db43c9c8948aa
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>