soc: qcom: scm-xpu: 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 SMC calling
convention. Use the new API while maintaining backward
compatibility.

Change-Id: I108e4bb968e44a7e8a81033f8f1a837e4abad25a
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>