Change Microsemi to Microchip.

Link: https://lore.kernel.org/r/20210714182847.50360-5-don.brace@microchip.comReviewed-by: Scott Benesh <scott.benesh@microchip.com>
Reviewed-by: Gerry Morong <gerry.morong@microchip.com>
Reviewed-by: Justin Lindley <Justin.lindley@microchip.com>
Signed-off-by: Don Brace <don.brace@microchip.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>