MAINTAINERS: Update linux-fpga repository location

As maintainer team we have decided to move the linux-fpga development
to a shared repository with shared access.

Cc: Xu Yilun <yilun.xu@intel.com>
Cc: Wu Hao <hao.wu@intel.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Moritz Fischer <mdf@kernel.org>

MAINTAINERS

@@ -7717,7 +7717,7 @@ R:	Tom Rix <trix@redhat.com>
 L:	linux-fpga@vger.kernel.org
 S:	Maintained
 Q:	http://patchwork.kernel.org/project/linux-fpga/list/
-T:	git git://git.kernel.org/pub/scm/linux/kernel/git/mdf/linux-fpga.git
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/fpga/linux-fpga.git
 F:	Documentation/devicetree/bindings/fpga/
 F:	Documentation/driver-api/fpga/
 F:	Documentation/fpga/