ARM: dts: DRA7: Add standby info for IPU & DSPs

Add the data for the "ti,rproc-standby-info" property for all
the DSP and IPU remoteproc processor nodes on DRA7xx family of
SoCs. This data is same for all DRA7 boards, and is required
by the OMAP remoteproc driver to implement suspend/resume for
the IPU & DSP remoteproc devices on DRA7 SoCs.

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