metrics: Add new HPS power on metrics

This patch adds new HPS boot metrics to measure how often a boot failure
during power-on occurs and how often we are able to recover from it.

Bug: b:228917921
Change-Id: Icc31dab7fb8cd28ac25235b8b2423239d80ecd41
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3615700
Reviewed-by: Guoxing Zhao <charleszhao@chromium.org>
Commit-Queue: Guoxing Zhao <charleszhao@chromium.org>
Auto-Submit: Sami Kyöstilä <skyostil@chromium.org>
Cr-Commit-Position: refs/heads/main@{#998619}

tools/metrics/histograms/enums.xml

@@ -45378,6 +45378,8 @@ Called by update_gpu_driver_bug_workaround_entries.py.-->
   <int value="11" label="SPI flash update failed"/>
   <int value="12" label="MCU flash update sent but requested again on reboot"/>
   <int value="13" label="SPI flash update sent but requested again on reboot"/>
+  <int value="14" label="Power on recovery succeeded"/>
+  <int value="15" label="Power on recovery failed"/>
 </enum>
 
 <enum name="HrefTranslatePrefsFilterStatus">