linux-phytec-ti

ti_config_fragments: rpmsg: Add RPMsg domain config fragment file

Add the initial IPC/RPMsg domain config fragment file. This will
form the foundation for adding all the RPMsg related module
configurations, to be used by the TI Linux integration kernel.

Also, enable the fully upstreamed OMAP HwSpinlock driver while
at this. There are currently no direct users of the HwSpinlock
IP, but the built-in is the preferred choice for this driver.

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