ubox: support quiet modprobe, support millisecond log timestamp accuracy

Update ubox to latest Git HEAD in order to import the following fixes:

ac2d43e kmodloader: support '-q' quiet option
f8d3d16 ubox: Add an option for more accurate timestamps in log

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

package/system/ubox/Makefile

@@ -5,9 +5,9 @@ PKG_RELEASE:=1
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(LEDE_GIT)/project/ubox.git
-PKG_SOURCE_DATE:=2017-01-26
-PKG_SOURCE_VERSION:=14839f0acc15197e360299b7f714b8f9ff97ba17
-PKG_MIRROR_HASH:=6a69c9af17bfe18988c3984478c1ee4041795af9345267d6f1262a09f3386cb0
+PKG_SOURCE_DATE:=2017-01-29
+PKG_SOURCE_VERSION:=ac2d43e7c84fa3041ee2bf5709fdf69352189317
+PKG_MIRROR_HASH:=f793550b6164f519a08ff2d8cb7c5ca74e8d573c03f0d7ee6473db3cbb90ee3a
 CMAKE_INSTALL:=1
 
 PKG_LICENSE:=GPL-2.0