soc: ti: pruss: Add pruss_get()/put() API

Add two new get and put API, pruss_get() and pruss_put() to the
PRUSS platform driver to allow client drivers to request a handle
to a PRUSS device. This handle will be used by client drivers to
request various operations of the PRUSS platform driver through
additional API that will be added in the following patches.

The pruss_get() function returns the pruss handle corresponding
to a PRUSS device referenced by a PRU remoteproc instance. The
pruss_put() is the complimentary function to pruss_get().

Co-developed-by: Suman Anna <[email protected]>
Signed-off-by: Suman Anna <[email protected]>
Signed-off-by: Tero Kristo <[email protected]>
Co-developed-by: Grzegorz Jaszczyk <[email protected]>
Signed-off-by: Grzegorz Jaszczyk <[email protected]>
Signed-off-by: Puranjay Mohan <[email protected]>
Reviewed-by: Roger Quadros <[email protected]>
Reviewed-by: Tony Lindgren <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Acked-by: Mathieu Poirier <[email protected]>
Signed-off-by: MD Danish Anwar <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Nishanth Menon <[email protected]>

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