msm: scm-pas: Add support for memory setup command

To support relocatable images PIL needs to inform the
authenticator about where the relocated region resides. Add an
API:

    pas_mem_setup(enum pas_id id, u32 start_addr, u32 len)

to facilitate this requirement. start_addr should be physical
address of the start of the relocatable region and len should be
the size of the relocatable region.

Change-Id: I2c7e1b66b3d3db2b8c7db812ffb452a2486136bf
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>