Use of_property_read_u32_array to get region cfgs

The parameter list for the of_property_for_each_u32() macro has changed
in kernel v6.6.76 and later. In order to make the region config parsing
compatible with both newer and older kernel versions, it has been
changed to use of_property_count_u32_elems() and
of_property_read_u32_array() to read the values.

Change-Id: Ic535690031eada30e0b51aa81c707c0ef024e231
Signed-off-by: Rajasekaran Kalidoss <rajasekaran.kalidoss@arm.com>