ARM: dts: msm: Update USB SSPHY init sequence for SDXPOORWILLS

Update Superspeed PHY initialization sequence according to the
Hardware Programming Guide recommendation.
Updated sequence improves margin for RX electrical compliance
test.

Change-Id: Ie7b211b5b8b1d57a4b13f4bc30c59062154cb224
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>