ARM: dts: msm: Update value of QUSB2PHY_PORT_TUNE1 for SM6150

This change updates QUSB2PHY_PORT_TUNE1 register value from
0xf8 to 0xc8 for better electrical compliance results on SM6150.

Change-Id: I5873bafee48f7ae4188c8aebc25b0f969d86cf4b
Signed-off-by: Pratham Pratap <prathampratap@codeaurora.org>