ti_config_fragments: rpmsg: Enable rpmsg-rpc driver

Add support to build the RPMsg bus/client driver rpmsg-rpc to
enable the MultiMedia hardware accelerated stack on DRA7xx/AM57xx
SoCs. The driver is currently supported only for OMAP remoteprocs
and depends on the OMAP remoteproc driver being enabled.

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

ti_config_fragments/ipc.cfg

@@ -22,6 +22,7 @@ CONFIG_KEYSTONE_REMOTEPROC=m
 # RPMsg
 CONFIG_RPMSG_VIRTIO=m
 CONFIG_RPMSG_PROTO=m
+CONFIG_RPMSG_RPC=m
 
 # DSP Memory Mapper for Keystone MPM
 CONFIG_KEYSTONE_DSP_MEM=m