Prepare v2018.07-rc2

Signed-off-by: Tom Rini <trini@konsulko.com>

Makefile

diff --git a/Makefile b/Makefile
index 6a190e7..fe7bf11 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@
 VERSION = 2018
 PATCHLEVEL = 07
 SUBLEVEL =
-EXTRAVERSION = -rc1
+EXTRAVERSION = -rc2
 NAME =
 
 # *DOCUMENTATION*