linux-phytec-ti

TEMP: dt-bindings: soc: ti: Add Keystone DSP Memory mapping binding

Add the device tree binding document for the userspace memory mapping
driver on TI Keystone SoCs. This driver is used to expose either some
portions of the DDR and/or some portions of the On-chip RAM controlled
by the Multicore Shared Memory Controller (MSMC) to userspace for the
Multi Proc Manager (MPM) stack.

Signed-off-by: Suman Anna <s-anna@ti.com>