remoteproc: k3: Factor out TI-SCI processor control OF get function

Building the TSP structure is common for users of the TI-SCI processor
control interface. Factor out this function and put it with the rest
of the TI-SCI processor control functions.

Signed-off-by: Andrew Davis <afd@ti.com>
Tested-by: Wadim Egorov <w.egorov@phytec.de>
Link: https://lore.kernel.org/r/20240802152109.137243-3-afd@ti.com


Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>