gitlab-ci: pass the correct toggles to configure

Trivial typos - s/admgpu/amdgpu/;s/vmwfgx/vmwgfx/

Fixes: 4a9030dc ("add gitlab-ci builds of libdrm")
Cc: Brian Starkey <brian.starkey@arm.com>
Reported-by: Brian Starkey <brian.starkey@arm.com>
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>