NSIS: Add missing firmware blobs

NSIS: Add missing firmware blobs

Various firmwares has been added in the pc-bios/ directory:

- CCW     (since commit 0c1fecdd523)
- skiboot (since commit bcad45de6a0)
- EDK2    (since commit f7fa38b74c3)

Since we install qemu-system able to run the architectures
targetted by these firmware, include them in the NSIS exe.

Reviewed-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20190723070218.3606-1-philmd@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>