usb: msm_otg: Allow support to use 2nd HSPHY with USB2 Core

Some platforms may have configuration to allow USB controller
work with any of the two HSPHYs present. By default driver
configures USB core to use primary HSPHY. Add support to allow
user select 2nd HSPHY using DT parameter.

Change-Id: I605aadf8109db385644a690fc945f482331bb347
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>