Merge pull request #504 from shenki/buildroot-2016.05

Buildroot 2016.05 and Linux 4.4.13
diff --git a/openpower/configs/garrison_defconfig b/openpower/configs/garrison_defconfig
index a3dff90..4f3c701 100644
--- a/openpower/configs/garrison_defconfig
+++ b/openpower/configs/garrison_defconfig
@@ -33,7 +33,7 @@
 
 # skiboot requirements
 BR2_SKIBOOT_CUSTOM_VERSION=y
-BR2_SKIBOOT_CUSTOM_VERSION_VALUE="e6b2e38abb906023c1ef3631b21ad00d26fc0b5f"
+BR2_SKIBOOT_CUSTOM_VERSION_VALUE="5f25590fd430265e69190aaa50f019e8dadad293"
 
 # petitboot requirements
 BR2_ENABLE_LOCALE_PURGE=y