ARM: dts: msm: Set TXHSXVTUNE0 value to 10 for MSM8937

To improve cross over voltages on SDM439, TXHSXVTUNE0 value needs
to be changed from default 11 to 10. Add the appropriate PHY init
sequence for the same.

Change-Id: I0c87cf601c601509d329485a530d2725c496138e
Signed-off-by: Ajay Agarwal <ajaya@codeaurora.org>