mmc-utils: update to latest git head

Signed-off-by: Michael Heimpold <mhei@heimpold.de>

utils/mmc-utils/Makefile

@@ -12,9 +12,9 @@ PKG_RELEASE:=1
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=https://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc-utils.git
-PKG_SOURCE_DATE:=2018-12-09
-PKG_SOURCE_VERSION:=aef913e31b659462fe6b9320d241676cba97f67b
-PKG_MIRROR_HASH:=8c3d872be1392b7a140a36ce75ed48ef300ee6b6f1ce1b37dad1ad263d338dc3
+PKG_SOURCE_DATE:=2019-08-08
+PKG_SOURCE_VERSION:=d40ec535b9d4e4c974e8c2fbfb422cd0348cc5e8
+PKG_MIRROR_HASH:=06bc3a82e173dc0b6823c04645b30db74e2686dc15559bb4e2d4805c43e30b51
 
 PKG_LICENSE:=GPL-2.0
 PKG_LICENSE_FILES:=