MAINTAINERS: Add HTE/timestamp subsystem details

Add tree, mailing list and patchwork details.
Signed-off-by: Dipen Patel <dipenp@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>

MAINTAINERS

@@ -9425,6 +9425,9 @@ F:	drivers/input/touchscreen/htcpen.c
 
 HTE SUBSYSTEM
 M:	Dipen Patel <dipenp@nvidia.com>
+L:	timestamp@lists.linux.dev
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/pateldipen1984/linux.git
+Q:	https://patchwork.kernel.org/project/timestamp/list/
 S:	Maintained
 F:	Documentation/devicetree/bindings/timestamp/
 F:	Documentation/driver-api/hte/