[Arista] Disable nohz on Hedgehog CPU cards (#24423)

Disabling nohz to help to mitigate MCEs.

Author: kenneth-arista

files/Aboot/boot0.j2

@@ -718,10 +718,15 @@ write_platform_specific_cmdline() {
         cmdline_add modprobe.blacklist=snd_hda_intel,hdaudio
         read_system_eeprom
     fi
-    if in_array "$platform" "lorikeet" "hedgehog"; then
+    if in_array "$platform" "lorikeet"; then
         cmdline_add reassign_prefmem
         read_system_eeprom
     fi
+    if in_array "$platform" "hedgehog"; then
+        cmdline_add reassign_prefmem
+        cmdline_add nohz=off
+        read_system_eeprom
+    fi
     if in_array "$platform" "prairieisland"; then
         read_system_eeprom
     fi