Sometimes the users might want to change the title showing on UEFI
booting screen, so far it's hard-coded to 'boot'.
There is not a easy way to customize it in current design, I tried
firstly with '--configfile', but that does not work with --use-uuid,
since the later option will generate a UUID and write it to boot
config, only when the former option is not enabled.
So a new source parameter 'titile' is added in this patch, it defaults
to 'boot' to be consistent with the original title.
Signed-off-by: Ming Liu <liu.ming50@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
