Shift Linux_build_test tests from MotoG4 to mokey (flutter#152750)

For flutter#148085

Author: zanderso

.ci.yaml

@@ -2854,7 +2854,7 @@ targets:
       task_name: flutter_gallery__transition_perf
       artifact: gallery__transition_perf
       drone_dimensions: >
-        ["device_os=N","os=Linux", "device_type=msm8952"]
+        ["device_os=N","os=Linux", "device_type=mokey"]
 
   - name: Linux_build_test flutter_gallery__transition_perf_e2e
     recipe: devicelab/devicelab_drone_build_test
@@ -2866,7 +2866,7 @@ targets:
       task_name: flutter_gallery__transition_perf_e2e
       artifact: gallery__transition_perf_e2e
       drone_dimensions: >
-        ["device_os=N","os=Linux", "device_type=msm8952"]
+        ["device_os=N","os=Linux", "device_type=mokey"]
 
   - name: Linux_build_test flutter_gallery__transition_perf_hybrid
     recipe: devicelab/devicelab_drone_build_test
@@ -2878,7 +2878,7 @@ targets:
       task_name: flutter_gallery__transition_perf_hybrid
       artifact: gallery__transition_perf_hybrid
       drone_dimensions: >
-        ["device_os=N","os=Linux", "device_type=msm8952"]
+        ["device_os=N","os=Linux", "device_type=mokey"]
 
   # linux mokey benchmark
   - name: Linux_mokey flutter_gallery__transition_perf_with_semantics