MAINTAINERS: Add Frank Li as PCI endpoint reviewer

I have volunteered to review PCI endpoint-related changes.  Add myself as a
reviewer to be notified when related patches are posted.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Link: https://patch.msgid.link/20260611210007.529205-1-Frank.Li@oss.nxp.com

MAINTAINERS

diff --git a/MAINTAINERS b/MAINTAINERS
index 2fb1c75..611fbb4 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -20498,6 +20498,7 @@
 M:	Manivannan Sadhasivam <mani@kernel.org>
 M:	Krzysztof Wilczyński <kwilczynski@kernel.org>
 R:	Kishon Vijay Abraham I <kishon@kernel.org>
+R:	Frank Li <Frank.Li@kernel.org>
 L:	linux-pci@vger.kernel.org
 S:	Supported
 Q:	https://patchwork.kernel.org/project/linux-pci/list/