gitlab-ci: pass the correct toggles to configure

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

Fixes: 4a9030dc8b ("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>

.gitlab-ci.yml

@@ -40,9 +40,9 @@
       --enable-libkms
       --enable-intel
       --enable-radeon
-      --enable-admgpu
+      --enable-amdgpu
       --enable-nouveau
-      --enable-vmwfgx
+      --enable-vmwgfx
       --enable-omap-experimental-api
       --enable-exynos-experimental-api
       --enable-freedreno