ARM: multi_v7_defconfig: Enable TI Remoteproc and related configs

This allows us to use the various remote processors on the TI OMAP and
Keystone family devices using the multi-v7 config, instead of only
with the OMAP/Keystone specific defconfigs (which we would like to
move away from needing).

Signed-off-by: Andrew Davis <afd@ti.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>