msm: msm_bus: Add support for non-interleaved memory

Whether interleaving is enabled is determined at run-time
by reading RPM status registers.
Based on that, bandwidth is allocated appropriately between
channels to the memory.

Change-Id: Iffb40b75f4370f091a27028fffde6e9c9243f584
Signed-off-by: Gagan Mac <gmac@codeaurora.org>