init-install-efi.sh: Update to support installing multiple kernels
We can no longer rely on the kernel having a static name of "vmlinuz".
This means we can't use it as a sentinel value in our sed commands, and
we can't just copy vmlinuz to the boot directory.
Instead, we'll use "root=" as the sentinel value for our sed commands,
and we'll search for common kernel names to copy into our boot
directory.
Signed-off-by: California Sullivan <california.l.sullivan@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
