ARM: dts: msm: Update the USB regulators on TRINKET

The VDD rail for HS and SS PHYs is moved from L4 to L7.
Update the same in the dt nodes for HS and SS PHY
to reflect the same.

Change-Id: I17ed016eea4c49a11ff9fc42ccac45d3e6b9ec35
Signed-off-by: Sriharsha Allenki <sallenki@codeaurora.org>