boards: arm: mimxrt595_evk_cm33: enable reboot support

The RT595 EVK needs the ROM to toggle the reset pin of the external
flash chip during a warm reset, in order to make sure the flash
is in a valid state. Add a write to the one time programmable shadow
registers when CONFIG_REBOOT=y in order to make sure the ROM will toggle
this pin.

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>