Merge branch 'firmware' into 'imx8-4.18-wip'

Disable firmware user mode helpers

Closes #31

See merge request !19
2 jobs for imx8-4.18-wip in 43 minutes and 7 seconds
Status Job ID Name Coverage
  Build
passed #19145
librem5
build:aarch64:Image

00:43:07

passed #19146
librem5
build:aarch64:deb

00:26:23