starnix: Skip boot-related tasks when there is no kernel

The Fuchsia Starnix image doesn't require a kernel. If the KERN-A
partition is of type "reserved", skip boot-related work.

BUG=chromium:209505710
TEST=Built amd64-starnix profile

Change-Id: Ie8e3a4f50241bae696fe2a4372abb8b4e457f090
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/3296624
Reviewed-by: Sergey Frolov <sfrolov@google.com>
Tested-by: Adam Lesinski <adamlesinski@google.com>
Commit-Queue: Adam Lesinski <adamlesinski@google.com>
1 file changed