MAINTAINERS: Add Manivannan Sadhasivam as PCI Endpoint reviewer

I've been reviewing the patches related to PCI Endpoint Subsystem for some
time. So I'd like to add myself as the reviewer to get immediate attention
to the patches.

Link: https://lore.kernel.org/r/20220819020817.197844-1-manivannan.sadhasivam@linaro.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>

Author: Mani-Sadhasivam

MAINTAINERS

@@ -15682,6 +15682,7 @@ PCI ENDPOINT SUBSYSTEM
 M:	Kishon Vijay Abraham I <kishon@ti.com>
 M:	Lorenzo Pieralisi <lpieralisi@kernel.org>
 R:	Krzysztof Wilczyński <kw@linux.com>
+R:	Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
 L:	linux-pci@vger.kernel.org
 S:	Supported
 Q:	https://patchwork.kernel.org/project/linux-pci/list/