release: Update VERSION for 1.12.0 release

Removes the release candidate tag for the final 1.12.0 release.

Signed-off-by: Maureen Helm <maureen.helm@nxp.com>
diff --git a/VERSION b/VERSION
index a8318f6..0b72864 100644
--- a/VERSION
+++ b/VERSION
@@ -2,4 +2,4 @@
 VERSION_MINOR = 12
 PATCHLEVEL = 0
 VERSION_TWEAK = 0
-EXTRAVERSION = rc3
+EXTRAVERSION =