efI: Allow packaging a kernel in the debugging script

Add an option to package a kernel into the debugging script used for
EFI.

The name of the kernel must be added to the script. By default it is
assumed that the kernel is built in the /tmp/kernel directory.

Signed-off-by: Simon Glass <sjg@chromium.org>

efi: Adjust script to show pre-relocation output on terminal

When running with video enabled, the pre-relocation output of U-Boot is
currently lost. Add a -serial flag to show it on the terminal.

Signed-off-by: Simon Glass <sjg@chromium.org>

efi: Add a script to build an image for testing on UEFI

It is quite complicated to run U-Boot on QEMU since we have four
different builds and they must use different versions of qemu and the
UEFI binaries.

Add a script to help. It requires U-Boot itself to be built. Once that
is done you can use this script to build an image for use with qemu and
optionally run it.

Signed-off-by: Simon Glass <sjg@chromium.org>

efi: Add a script to build an image for testing on UEFI

It is quite complicated to run U-Boot on QEMU since we have four
different builds and they must use different versions of qemu and the
UEFI binaries.

Add a script to help. It requires U-Boot itself to be built. Once that
is done you can use this script to build an image for use with qemu and
optionally run it.

Signed-off-by: Simon Glass <sjg@chromium.org>