modules: update OpenWrt

5feb0df9bb ramips: remove memory node for ZBT MT7621 devices
b80a98ae7f ramips: remove unnecessary DEVICE_PACKAGES for Belkin F7C027
bfe652c5bd oxnas: move service file to correct place
5b4e4a38d8 relayd: bump to version 2020-04-25
4e5a29827f umdns: update to version 2020-04-25
c2efc973d5 dnsmasq: fix dnssec+ntp chicken-and-egg workaround (FS#2574)
6c020577ae libpcap: fix build breakage with very high number of simultaneous jobs
efe837de84 openssl: bump to 1.1.1g
1df49d98e7 relayd: bump to version 2020-04-20
b71c7c261b umdns: update to version 2020-04-20
b6d8119c53 umdns: update to the version 2020-04-05
ef3df27507 umdns: suppress address-of-packed-member warning
55312cc202 binutils: add ALTERNATIVES for strings (FS#3001)
3b6f079d8d mbedtls: update to 2.16.6
67ed408af2 mvebu: cortexa9: correct cpu subtype
dee8fcfe9f tegra: correct cpu subtype
d8e0b015e8 mvebu: backport ClearFog SPI enablement

Compile-tested: ipq40xx, ath79