ast2400: Update prefered u-boot version

Change-Id: I8b1dc64b8f53b3f90c6a24b690507384912908a4
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/meta-ast2400/conf/machine/include/ast2400.inc b/meta-ast2400/conf/machine/include/ast2400.inc
index 22b9a1f..3107dc0 100644
--- a/meta-ast2400/conf/machine/include/ast2400.inc
+++ b/meta-ast2400/conf/machine/include/ast2400.inc
@@ -3,8 +3,8 @@
 #@DESCRIPTION: Common machine configuration for the Aspeed AST2400 Chip
 
 PREFERRED_PROVIDER_virtual/kernel ?= "linux-obmc"
-PREFERRED_VERSION_u-boot ?= "v2016.05+git%"
-PREFERRED_VERSION_u-boot-fw-utils ?= "v2016.05+git%"
+PREFERRED_VERSION_u-boot ?= "v2016.07+git%"
+PREFERRED_VERSION_u-boot-fw-utils ?= "v2016.07+git%"
 
 UBOOT_MACHINE ?= "ast_g4_ncsi_config"
 UBOOT_ENTRYPOINT ?= "0x40001000"