mailmap: map old company name to new one @microchip.com

Map my old email address @atmel.com to my new company name. It happened 3
years ago but I realized the existence of this file recently.

Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20190823083158.2649-3-nicolas.ferre@microchip.com


Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>