MAINTAINERS: fix a few more amdgpu tree links

Switch to gitlab.

Fixes: 101c2fae51 ("MAINTAINERS: update radeon/amdgpu/amdkfd git trees")
Cc: David Ward <david.ward@gatech.edu>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

MAINTAINERS

@@ -867,7 +867,7 @@ M:	Harry Wentland <harry.wentland@amd.com>
 M:	Leo Li <sunpeng.li@amd.com>
 L:	amd-gfx@lists.freedesktop.org
 S:	Supported
-T:	git git://people.freedesktop.org/~agd5f/linux
+T:	git https://gitlab.freedesktop.org/agd5f/linux.git
 F:	drivers/gpu/drm/amd/display/
 
 AMD ENERGY DRIVER
@@ -950,7 +950,7 @@ AMD POWERPLAY
 M:	Evan Quan <evan.quan@amd.com>
 L:	amd-gfx@lists.freedesktop.org
 S:	Supported
-T:	git git://people.freedesktop.org/~agd5f/linux
+T:	git https://gitlab.freedesktop.org/agd5f/linux.git
 F:	drivers/gpu/drm/amd/pm/powerplay/
 
 AMD SEATTLE DEVICE TREE SUPPORT