mb/amd: majolica,mandolin: Remove needless article from warning

At the end of the built, the line below is printed.

    coreboot has been built without an the Microchip EC FW.

Remove *an*, as one article is enough.

Change-Id: I28b24f0f2dade17e30e16cc6d935976e331a7a97
Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51842
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

0 files changed, 0 insertions, 0 deletions