MAINTAINERS: Add Jianjun Wang as MediaTek PCI co-maintainer

Update entry for MediaTek PCIe controller, add Jianjun Wang
as MediaTek PCI co-maintainer.

Link: https://lore.kernel.org/r/20210420061723.989-8-jianjun.wang@mediatek.comSigned-off-by: NJianjun Wang <jianjun.wang@mediatek.com>
Signed-off-by: NLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: NRyder Lee <ryder.lee@mediatek.com>

MAINTAINERS

@@ -13919,6 +13919,7 @@ F:	drivers/pci/controller/dwc/pcie-histb.c
 
 PCIE DRIVER FOR MEDIATEK
 M:	Ryder Lee <ryder.lee@mediatek.com>
+M:	Jianjun Wang <jianjun.wang@mediatek.com>
 L:	linux-pci@vger.kernel.org
 L:	linux-mediatek@lists.infradead.org
 S:	Supported