fix config.ar71xx.generic.lowmem

sync other configs
10 jobs for add_buildroot_variant in 320 minutes and 50 seconds (queued for 15 seconds)
Status Name Job ID Coverage
  Build
passed build:ar71xx.generic #3819
docker

01:09:16

passed build:ar71xx.tiny #3818
docker

00:24:33

passed build:ipq40xx #3835
docker

00:24:51

passed build:lantiq #3836
docker

00:23:57

passed build:ramips #3822
docker

01:21:10

passed build:x64 #3821
docker

00:46:08

passed build:x86 #3820
docker

00:31:00

failed build:ipq40xx #3824
docker

failed build:lantiq #3823
docker

 
  Deploy
passed build:finish #3825
docker

00:19:52