chromeos-initramfs: Build miniOS executable

The chromeos-initramfs should now build minios GN by calling into
minios-*.ebuild when building the initramfs for minios.

There is a plan to move the entire miniOS build under platform2.

BUG=b:175069883, b:169261043
TEST=USE="$USE minios_ramfs minios" emerge-$B chromeos-initramfs

Change-Id: I8b99582fa95226b6ca2f3f64b00ffc5e5c8ddb8e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/2592110
Tested-by: Jae Hoon Kim <kimjae@chromium.org>
Reviewed-by: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Jae Hoon Kim <kimjae@chromium.org>
1 file changed