boards: intel_s1000_crb: add zephyr,flash-controller to DTS

The board has a SPI NOR flash enabled by default but was missing
the "zephyr,flash-controller" in DTS. This prevents the flash
shell sample to compile. So add the DTS entry.

Fixes #26764

Signed-off-by: Daniel Leung <daniel.leung@intel.com>
1 file changed