cxl: Use of_property_ accessor functions

The CXL driver has its own custom implementations of typed DT property
accessors. Replace the custom property accessor functions with the
common DT property functions.

This clean-up is part of a larger effort to remove of_get_property() and
other DT functions which leak pointers to DT node and property data.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20240729-dt-cxl-cleanup-v1-2-a75eea80d231@kernel.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>