Documentation: Add coreboot logo in BMP format for payload use

Using 'convert' to convert the SVG logo to BMP for Tianocore
introduces terrible aliasing, so add a logo in BMP format
(converted using GIMP).

The default logo file used by Tianocore will be changed in a
subsequent commit.

Change-Id: I2490707a330713709dd4ba8ae99b22b123ba64da
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66143
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Sean Rhodes <sean@starlabs.systems>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>
diff --git a/Documentation/coreboot_logo.bmp b/Documentation/coreboot_logo.bmp
new file mode 100644
index 0000000..08059d9
--- /dev/null
+++ b/Documentation/coreboot_logo.bmp
Binary files differ