arm: aarch32: config static regions with MPU disabled

There is the possibility that when reconfiguring the static regions,
some data that must be accessed is temporarily not accesible due to the
change on the MPU regions configuration. Workaround by disabling MPU
when doing the reconfiguration, same as with dynamic regions, until BR
can be enabled.

Signed-off-by: Duong Vu Nam <duong.vunam@nxp.com>