soc: fsl: guts: add a global structure to hold state

Add the fsl_soc_guts structure in order to pass information like base
addresses, endianness etc between the init time and the runtime
operations (RCW override) which will get added in future patches.
There is no point in mapping and unmapping the DCFG CCSR space every
time we need to make a read, just map it once and keep its reference in
this new global structure.

Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://lore.kernel.org/r/20260721231603.67865-4-vladimir.oltean@nxp.com
[chleroy: fixed typo on 'structure' in commit message]
Signed-off-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>

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