MAINTAINERS: Add Daire McNamara as Microchip PCIe driver maintainer

Link: https://lore.kernel.org/r/20210125162934.5335-5-daire.mcnamara@microchip.com


Signed-off-by: Daire McNamara <daire.mcnamara@microchip.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>