MAINTAINERS: Update module subsystem maintainers and repository

Add myself as a maintainer for module support as I'll be handling pull
requests for the next six months according to the previously announced
rotation [1][2].  Also, update the git repository link to point to the
modules tree, which is already used by linux-next.

Link: https://lore.kernel.org/linux-modules/Z3gDAnPlA3SZEbgl@bombadil.infradead.org [1]
Link: https://lore.kernel.org/linux-modules/20251203234840.3720-1-da.gomez@kernel.org/ [2]
Acked-by: Daniel Gomez <da.gomez@samsung.com>
Acked-by: Petr Pavlu <petr.pavlu@suse.com>
Reviewed-by: Aaron Tomlin <atomlin@atomlin.com>
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>

Author: samitolvanen

MAINTAINERS

@@ -17613,12 +17613,12 @@ MODULE SUPPORT
 M:	Luis Chamberlain <mcgrof@kernel.org>
 M:	Petr Pavlu <petr.pavlu@suse.com>
 M:	Daniel Gomez <da.gomez@kernel.org>
-R:	Sami Tolvanen <samitolvanen@google.com>
+M:	Sami Tolvanen <samitolvanen@google.com>
 R:	Aaron Tomlin <atomlin@atomlin.com>
 L:	linux-modules@vger.kernel.org
 L:	linux-kernel@vger.kernel.org
 S:	Maintained
-T:	git git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux.git modules-next
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/modules/linux.git modules-next
 F:	include/linux/kmod.h
 F:	include/linux/module*.h
 F:	kernel/module/