main/mkinitfs: backport rpirtc support

Backport rpirtc fix
8 jobs for !2280 with v3.10-rtcrpi in 1 minute and 39 seconds (queued for 1 second)
latest detached
Status Job ID Name Coverage
  Lint
failed #25464
x86_64 docker-alpine allowed to fail
lint

00:00:55

failed #24956
docker-alpine x86_64 allowed to fail
lint

00:00:29

 
  Build
passed #24961
docker-alpine ci-build aarch64
build-aarch64

00:00:31

passed #24962
docker-alpine ci-build armv7
build-armv7

00:00:40

passed #24960
docker-alpine ci-build ppc64le
build-ppc64le

00:00:41

passed #24959
docker-alpine ci-build s390x
build-s390x

00:00:27

passed #24958
docker-alpine ci-build x86
build-x86

00:00:25

passed #24957
docker-alpine ci-build x86_64
build-x86_64

00:00:24

 
Name Stage Failure
failed
lint Lint
No job log