This change adds USB DIAG function driver to support diagnostics
functionality with USB transport. It also updates USB PID and
serial number wiht IMEM address. This snapshot is taken as of
msm-5.10 commit 4735cf134b47 ("Merge "msm: kgsl: Add a sysfs node
to control performance counter reads").
Change-Id: I0f1a4e200e8798ec698a27c85b265f3abcf48773
Signed-off-by: Mayank Rana <quic_mrana@quicinc.com>