release: Zephyr 1.9.0-rc2

Signed-off-by: Anas Nashif <anas.nashif@intel.com>
diff --git a/Makefile b/Makefile
index 05269c6..3669f18 100644
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,7 @@
 VERSION_MINOR 	   = 9
 PATCHLEVEL 	   = 0
 VERSION_RESERVED   = 0
-EXTRAVERSION       = -rc1
+EXTRAVERSION       = -rc2
 NAME 		   = Zephyr Kernel
 
 export SOURCE_DIR PROJECT