MAINTAINERS: Add myself as the FPGA maintainer

FPGA subsystem requires special care that's why it should be maintained
via one tree.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

MAINTAINERS

@@ -390,6 +390,14 @@ F:	test/py/tests/test_efi*
 F:	cmd/bootefi.c
 F:	tools/file2include.c
 
+FPGA
+M:	Michal Simek <michal.simek@xilinx.com>
+S:	Maintained
+T:	git git://git.denx.de/u-boot-microblaze.git
+F:	drivers/fpga/
+F:	cmd/fpga.c
+F:	include/fpga.h
+
 FLATTENED DEVICE TREE
 M:	Simon Glass <sjg@chromium.org>
 S:	Maintained