[Mellanox] support newly added reboot cause (#10531)

- Why I did it
Implement newly added reboot causes in PR sonic-net/sonic-platform-common#277

- How I did it
Map the reboot cause sysfs to the newly added reboot causes.

- How to verify it
manual test, check whether the reboot cause is correct after rebooting the switch in various ways.
run the community reboot test to see whether the reboot cause checker is passing.

Signed-off-by: Kebo Liu <kebol@nvidia.com>

platform/mellanox/mlnx-platform-api/sonic_platform/chassis.py

@@ -657,24 +657,23 @@ def initialize_reboot_cause(self):
         self.reboot_major_cause_dict = {
             'reset_main_pwr_fail'       :   self.REBOOT_CAUSE_POWER_LOSS,
             'reset_aux_pwr_or_ref'      :   self.REBOOT_CAUSE_POWER_LOSS,
+            'reset_comex_pwr_fail'      :   self.REBOOT_CAUSE_POWER_LOSS,
             'reset_asic_thermal'        :   self.REBOOT_CAUSE_THERMAL_OVERLOAD_ASIC,
+            'reset_comex_thermal'       :   self.REBOOT_CAUSE_THERMAL_OVERLOAD_CPU,
             'reset_hotswap_or_wd'       :   self.REBOOT_CAUSE_WATCHDOG,
+            'reset_comex_wd'            :   self.REBOOT_CAUSE_WATCHDOG,
             'reset_swb_wd'              :   self.REBOOT_CAUSE_WATCHDOG,
-            'reset_sff_wd'              :   self.REBOOT_CAUSE_WATCHDOG
-        }
-        self.reboot_minor_cause_dict = {
-            'reset_fw_reset'            :   "Reset by ASIC firmware",
-            'reset_long_pb'             :   "Reset by long press on power button",
-            'reset_short_pb'            :   "Reset by short press on power button",
-            'reset_comex_thermal'       :   "ComEx thermal shutdown",
-            'reset_comex_pwr_fail'      :   "ComEx power fail",
-            'reset_comex_wd'            :   "Reset requested from ComEx",
-            'reset_from_asic'           :   "Reset requested from ASIC",
-            'reset_reload_bios'         :   "Reset caused by BIOS reload",
-            'reset_hotswap_or_halt'     :   "Reset caused by hotswap or halt",
-            'reset_from_comex'          :   "Reset from ComEx",
-            'reset_voltmon_upgrade_fail':   "Reset due to voltage monitor devices upgrade failure"
+            'reset_sff_wd'              :   self.REBOOT_CAUSE_WATCHDOG,
+            'reset_hotswap_or_halt'     :   self.REBOOT_CAUSE_HARDWARE_OTHER,
+            'reset_voltmon_upgrade_fail':   self.REBOOT_CAUSE_HARDWARE_OTHER,
+            'reset_reload_bios'         :   self.REBOOT_CAUSE_HARDWARE_BIOS,
+            'reset_from_comex'          :   self.REBOOT_CAUSE_HARDWARE_CPU,
+            'reset_fw_reset'            :   self.REBOOT_CAUSE_HARDWARE_RESET_FROM_ASIC,
+            'reset_from_asic'           :   self.REBOOT_CAUSE_HARDWARE_RESET_FROM_ASIC,
+            'reset_long_pb'             :   self.REBOOT_CAUSE_HARDWARE_BUTTON,
+            'reset_short_pb'            :   self.REBOOT_CAUSE_HARDWARE_BUTTON
         }
+        self.reboot_minor_cause_dict = {}
         self.reboot_by_software = 'reset_sw_reset'
         self.reboot_cause_initialized = True