usb: phy: qusb: Add support for the new scm_call2 API

The scm library has added support for a new secure world
interface that is more aligned to the ARMv8 SCM calling
convention. Use the new API while maintaining backward
compatibility.

Change-Id: I7d1553a82ff5f104ded7028a391fc649c9db4b5b
Signed-off-by: Sriharsha Allenki <sallenki@codeaurora.org>