adb: fix missing PKG_MIRROR_HASH

This package was missing a PKG_MIRROR_HASH value.

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

package/utils/adb/Makefile

@@ -8,6 +8,7 @@ PKG_RELEASE:=2
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=https://android.googlesource.com/platform/system/core
 PKG_SOURCE_VERSION:=6fe92d1a3fb17545d82d020a3c995f32e6b71f9d
+PKG_MIRROR_HASH:=a9b4b86602dfc0d4fc9e1d0f78dc83e648a931fb04f5a4be9b1f0054a8cebf7e
 PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_SOURCE_VERSION)
 PKG_SOURCE:=$(PKG_SOURCE_SUBDIR).tar.xz
 PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_SOURCE_SUBDIR)