Remove the "zephyr,memory-region-mpu" property, deprecated in Zephyr 3.5
in favor of the "zephyr,memory-attr" bitmask.
The three BUILD_ASSERT tripwires in the ARM/ARM64 MPU drivers already
turned any remaining use of the property into a build failure, so they go
away with it, together with the now unused NODE_HAS_PROP_AND_OR helper.
The migration section in doc/services/mem_mgmt/index.rst documented a
property that no longer exists, so it is dropped and its value mapping
table moved to the 4.5 migration guide.
Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>
Assisted-by: Claude:opus-5
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