MAINTAINERS: Remove Jianguo Sun from HiSilicon STB DWC entry

Jianguo Sun's email address reported in MAINTAINERS is not active any
longer, remove it from the DWC HiSilicon STB entry.
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Shawn Guo <shawn.guo@linaro.org>

MAINTAINERS

@@ -11541,7 +11541,6 @@ F:	Documentation/devicetree/bindings/pci/kirin-pcie.txt
 F:	drivers/pci/controller/dwc/pcie-kirin.c
 
 PCIE DRIVER FOR HISILICON STB
-M:	Jianguo Sun <sunjianguo1@huawei.com>
 M:	Shawn Guo <shawn.guo@linaro.org>
 L:	linux-pci@vger.kernel.org
 S:	Maintained