drivers/i2c/at24rf08c/lenovo_serials.c: Upper-case'ify

Thereby making consistent with other i2c drivers

Change-Id: I5ddc9d98fbbc1db68a933e3b9a6b92f309b72c41
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/7589
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
drivers/i2c/at24rf08c/lenovo_serials.c: Use NULL over '0'

Change-Id: I7d8922d1812814ea2ebd72aaf5b5e28dc592bfb3
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/7590
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>