release: Zephyr 1.9.0-rc1

Signed-off-by: Anas Nashif <anas.nashif@intel.com>
diff --git a/Makefile b/Makefile
index 2f937b9..05269c6 100644
--- a/Makefile
+++ b/Makefile
@@ -1,8 +1,8 @@
 VERSION_MAJOR 	   = 1
-VERSION_MINOR 	   = 8
-PATCHLEVEL 	   = 99
+VERSION_MINOR 	   = 9
+PATCHLEVEL 	   = 0
 VERSION_RESERVED   = 0
-EXTRAVERSION       =
+EXTRAVERSION       = -rc1
 NAME 		   = Zephyr Kernel
 
 export SOURCE_DIR PROJECT