Revert "roms: switch oldnoconfig to olddefconfig"

This reverts commit a5519b42cfd6c00e9f8b31c5aad7682e7a9f1181.

Breaks "make bios" in roms/ as the kconfig version in seabios doesn't
support olddefconfig.  Must have been be totally untested.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

roms/configure-seabios.sh

@@ -2,4 +2,4 @@
 config="$1"
 make -C seabios clean distclean
 cp "$config" seabios/.config
-make -C seabios olddefconfig
+make -C seabios oldnoconfig