devmem2: add a hash file

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/devmem2/devmem2.hash

@@ -0,0 +1,2 @@
+# Locally calculated
+sha256 3b15515693bae1ebd14d914e46d388edfec2175829ea1576a7a0c8606ebbe639  devmem2.c