board: trim busybox defconfigs a bit #62

Job	Run time
container (curios) / build (arm64)	13m 57s
container (curios) / build (amd64)	13m 33s
container (curios-httpd) / build (amd64)	4m 42s
container (curios-httpd) / build (arm64)	4m 17s
container (curios-nftables) / build (amd64)	4m 53s
container (curios-ntpd) / build (arm64)	5m 44s
container (curios-ntpd) / build (amd64)	5m 41s
container (curios-nftables) / build (arm64)	5m 9s
container (curios-httpd) / push	15s
container (curios-nftables) / push	17s
container (curios-ntpd) / push	25s
container (curios) / push	24s
	59m 17s

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