configs: Add some sample default configuration files

Test some config options that don't typically get tested.

Change-Id: Ie05c99411c8ce6462a6f5502b086ee2b72a4324b
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/17591
Tested-by: build bot (Jenkins)
Reviewed-by: Nico Huber <nico.h@gmx.de>

configs/config.emulation_qemu_x86_i440fx

@@ -0,0 +1 @@
+# Everything is default, so the config is empty.