payloads/tianocore: Add option for custom bootsplash

Add Kconfig options to use custom bootsplash file,
dependent on using MrChromebox's stable branch, with
help info conveying required file format.

Adjust Makefile to copy the custom bootsplash and
overwrite the default Logo.bmp file, handling both
absolute and relative paths, and restore the original
logo file after building so as to keep the working
directory clean.

Test: build with and without custom bootsplash, ensure
correct bootsplash displayed

Change-Id: I164f46777169801cff56633fd920bc81b7c8129a
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/31561
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

0 files changed, 0 insertions, 0 deletions