boards: nxp: rd_rw612_bga: enable support for flash

Enable support for the mx25u51245g flash chip present on the
RD RW612 BGA. Support has been verified with the following samples:

- samples/drivers/flash_shell
- tests/drivers/flash/common

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