platform: msm_shared: Fix scm init and scm_io_read

Make sure scm driver is initialized before any client calls into scm and
fix the return value of scm_io_read to return the value read from the
register instead of api success/failure values.

Change-Id: Ic43b9c8ec51876eec1c033ae1f2f71560ea7b9f7
1 file changed