Use only mac x64 machines. (#32752)

Author: godofredoc

ci/builders/mac_host_engine.json

@@ -17,7 +17,8 @@
             ],
             "drone_dimensions": [
                 "device_type=none",
-                "os=Mac-12"
+                "os=Mac-12",
+		"cpu=x64"
             ],
             "gclient_custom_vars": {
                 "download_android_deps": false
@@ -58,7 +59,8 @@
             ],
             "drone_dimensions": [
                 "device_type=none",
-                "os=Mac-12"
+                "os=Mac-12",
+		"cpu=x64"
             ],
             "gclient_custom_vars": {
                 "download_android_deps": false
@@ -111,7 +113,8 @@
             ],
             "drone_dimensions": [
                 "device_type=none",
-                "os=Mac-12"
+                "os=Mac-12",
+		"cpu=x64"
             ],
             "gclient_custom_vars": {
                 "download_android_deps": false
@@ -147,7 +150,8 @@
             ],
             "drone_dimensions": [
                 "device_type=none",
-                "os=Mac-12"
+                "os=Mac-12",
+		"cpu=x64"
             ],
             "gclient_custom_vars": {
                 "download_android_deps": false
@@ -181,7 +185,8 @@
             ],
             "drone_dimensions": [
                 "device_type=none",
-                "os=Mac-12"
+                "os=Mac-12",
+		"cpu=x64"
             ],
             "gclient_custom_vars": {
                 "download_android_deps": false
@@ -212,7 +217,8 @@
             ],
             "drone_dimensions": [
                 "device_type=none",
-                "os=Mac-12"
+                "os=Mac-12",
+		"cpu=x64"
             ],
             "gclient_custom_vars": {
                 "download_android_deps": false