superio/nuvoton: Use official spelling of Nuvoton in `CHIP_NAME`

The official spelling of Nuvoton is not all uppercase. Only the first
letter is uppercase. See the footer of the Nuvoton Web site.

Change-Id: I6ccd4194d7be0c89f8b332fcca5feb2420a4de1e
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-on: https://review.coreboot.org/5928
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
2 files changed