grub: add grub-nativesdk
Add nativesdk support to make grub-mkimage tool part of Host tools
in the generated SDK.
The conf file should have "TOOLCHAIN_HOST_TASK_append = " nativesdk-grub"
for the grub-mkimage to show up.
Signed-off-by: Khasim Syed Mohammed <khasim.mohammed@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>