boards: arm: mps2_an521: remove the arm,num-mpu-regions property
The SSE-200 implementation on AN521 only has 8 regions.
Although the AN521 FPGA image implements the documented value,
qemu-system-arm currently shows in MPU_TYPE the incorrect value of 16.
Removing the property definition allows the code to rely on the register
read value and work on both qemu-system-arm & the physical board.
Signed-off-by:
Wilfried Chauveau <wilfried.chauveau@arm.com>
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