MAINTAINERS: Add Chuanhua Lei as Intel LGM GW PCIe maintainer

Rahul Tanwar is no longer at Maxlinear, so update the MAINTAINERS entry
for the PCIe driver for Intel LGM GW SoC.

Link: https://lore.kernel.org/r/20230519044555.3750-2-yzhu@maxlinear.com


Signed-off-by: Zhu YiXin <yzhu@maxlinear.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rahul Tanwar <rahul_tanwar@yahoo.com>
Acked-by: Lei Chuanhua <lchuanhua@maxlinear.com>