boards: v2m_musca_b1_nonsecure: add flash to yaml

Specify flash size to help filtering with sanitycheck.

Signed-off-by: Anas Nashif <[email protected]>

Author: nashif

boards/arm/v2m_musca_b1/v2m_musca_b1_nonsecure.yaml

@@ -7,3 +7,4 @@ toolchain:
   - gnuarmemb
   - xtools
 ram: 64
+flash: 32