MAINTAINERS: Add Kishon Vijay Abraham I for TI J721E SoC PCIe

Add Kishon Vijay Abraham I as MAINTAINER for TI J721E SoC PCIe.

Link: https://lore.kernel.org/r/20200722110317.4744-16-kishon@ti.com


Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Rob Herring <robh@kernel.org>