arm: dts: k3-j7200: Fix support for OSPI flash

- Add the missing bootph-all property in the flash subnode for ospi
- Add the missing overrides for the ospi node in the r5 devicetree

Signed-off-by: Aniket Limaye <a-limaye@ti.com>
Reviewed-by: Udit Kumar <u-kumar1@ti.com>