Prepare v2015.04-rc2

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

Makefile

diff --git a/Makefile b/Makefile
index 0538821..bd4abab 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 VERSION = 2015
 PATCHLEVEL = 04
 SUBLEVEL =
-EXTRAVERSION = -rc1
+EXTRAVERSION = -rc2
 NAME =
 
 # *DOCUMENTATION*