modules: update OpenWrt

89808e211c kernel: bump 4.14 to 4.14.137
349714a491 kernel: bump 4.9 to 4.9.188
0a4a82a431 config: introduce separate CONFIG_SIGNATURE_CHECK option
8a83892662 packages: apply usign padding workarounds to package indexes if needed
0bce1d0db9 usign: update to latest Git HEAD
958411aa61 kernel: bump 4.14 to 4.14.136
2807f84b62 kernel: bump 4.9 to 4.9.187
7e4ce0c655 ar71xx: wpj531: fix SIG1/RSS1 LED GPIO

Compile-tested: ar71xx, mpc85xx

modules

@@ -2,7 +2,7 @@ GLUON_FEEDS='packages routing luci gluon'
 
 OPENWRT_REPO=https://git.openwrt.org/openwrt/openwrt.git
 OPENWRT_BRANCH=openwrt-18.06
-OPENWRT_COMMIT=b7e7d220e7eff6ac1d73c5b97dec448704b26735
+OPENWRT_COMMIT=89808e211cd5ef5989bd0becb8cd45f9340610ff
 
 PACKAGES_PACKAGES_REPO=https://github.com/openwrt/packages.git
 PACKAGES_PACKAGES_BRANCH=openwrt-18.06