Add src-side configs for chromeos-betty-pi-arc-cfi-thin-lto-chrome.

In preparation for removing the N betty bots.

Bug: b/150926708
Change-Id: I2c98c09cfff229393b55bae6b916b5b0b81eea1c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2098843
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Commit-Queue: John Budorick <jbudorick@chromium.org>
Auto-Submit: Ben Pastene <bpastene@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749330}

testing/buildbot/chrome.json

@@ -73,6 +73,11 @@
       }
     ]
   },
+  "chromeos-betty-pi-arc-cfi-thin-lto-chrome": {
+    "additional_compile_targets": [
+      "chromiumos_preflight"
+    ]
+  },
   "chromeos-betty-pi-arc-chrome": {
     "additional_compile_targets": [
       "chromiumos_preflight"

testing/buildbot/waterfalls.pyl

@@ -39,6 +39,11 @@
           ],
         },
       },
+      'chromeos-betty-pi-arc-cfi-thin-lto-chrome': {
+        'additional_compile_targets': [
+          'chromiumos_preflight',
+        ],
+      },
       'chromeos-betty-pi-arc-chrome': {
         'additional_compile_targets': [
           'chromiumos_preflight',

tools/mb/mb_config.pyl

@@ -17,6 +17,7 @@
       'chromeos-arm-generic-cfi-thin-lto-chrome': 'cros_chrome_sdk_cfi_thin_lto',
       'chromeos-betty-cfi-thin-lto-chrome': 'cros_chrome_sdk_cfi_thin_lto',
       'chromeos-betty-chrome': 'cros_chrome_sdk_include_unwind_tables',
+      'chromeos-betty-pi-arc-cfi-thin-lto-chrome': 'cros_chrome_sdk_cfi_thin_lto',
       'chromeos-betty-pi-arc-chrome': 'cros_chrome_sdk_include_unwind_tables',
       'chromeos-eve-chrome': 'cros_chrome_sdk_include_unwind_tables',
       'chromeos-kevin-chrome': 'cros_chrome_sdk_include_unwind_tables',