MAINTAINERS: Update my git repository URLs

I'm moving my git repositories to gitlab.com, update MAINTAINERS
to point to the correct URL.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20201214212032.2999853-1-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

MAINTAINERS

@@ -344,7 +344,7 @@ F: tests/tcg/x86_64/
 F: hw/i386/
 F: disas/i386.c
 F: docs/system/cpu-models-x86.rst.inc
-T: git https://github.com/ehabkost/qemu.git x86-next
+T: git https://gitlab.com/ehabkost/qemu.git x86-next
 
 Xtensa TCG CPUs
 M: Max Filippov <jcmvbkbc@gmail.com>
@@ -1557,7 +1557,7 @@ F: include/hw/boards.h
 F: include/hw/core/cpu.h
 F: include/hw/cpu/cluster.h
 F: include/sysemu/numa.h
-T: git https://github.com/ehabkost/qemu.git machine-next
+T: git https://gitlab.com/ehabkost/qemu.git machine-next
 
 Xtensa Machines
 ---------------
@@ -2412,7 +2412,7 @@ M: Igor Mammedov <imammedo@redhat.com>
 S: Maintained
 F: backends/hostmem*.c
 F: include/sysemu/hostmem.h
-T: git https://github.com/ehabkost/qemu.git machine-next
+T: git https://gitlab.com/ehabkost/qemu.git machine-next
 
 Cryptodev Backends
 M: Gonglei <arei.gonglei@huawei.com>