release: Move version to 1.12.0-rc2

Updates the VERSION file to 1.12.0-rc2

Signed-off-by: Maureen Helm <maureen.helm@nxp.com>
diff --git a/VERSION b/VERSION
index 3253c52..354f7c2 100644
--- a/VERSION
+++ b/VERSION
@@ -2,4 +2,4 @@
 VERSION_MINOR = 12
 PATCHLEVEL = 0
 VERSION_TWEAK = 0
-EXTRAVERSION = rc1
+EXTRAVERSION = rc2