soc: ti: pruss: Add pruss_cfg_read()/update(), pruss_cfg_get_gpmux()/set_gpmux() APIs

Add two new generic API pruss_cfg_read() and pruss_cfg_update() to
the PRUSS platform driver to read and program respectively a register
within the PRUSS CFG sub-module represented by a syscon driver. These
APIs are internal to PRUSS driver.

Add two new helper functions pruss_cfg_get_gpmux() & pruss_cfg_set_gpmux()
to get and set the GP MUX mode for programming the PRUSS internal wrapper
mux functionality as needed by usecases.

Various useful registers and macros for certain register bit-fields and
their values have also been added.

Signed-off-by: Suman Anna <[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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