include: arm: nxp_mpu: remove redundant HAL include

The inclusion of `fsl_common.h` solely for defining `NXP_MPU_BASE`
is redundant, as this symbol is not used. Consequently, this
unnecessary inclusion leads to the pervasive inclusion of HAL
headers through kernel headers.
The needed HAL definitions are already included into the NXP MPU
driver implementation via the SoC header.

Signed-off-by: Manuel Argüelles <manuel.arguelles@nxp.com>