[installer] Add CSTATE configuration for the AMD CPU. (sonic-net#22006)

[installer] Add CSTATE configuration for the AMD CPU.

Author: oleksandrivantsiv

installer/default_platform.conf

@@ -484,6 +484,9 @@ bootloader_menu_config()
     if echo "$CPUVENDOR" | grep -i 'Intel' >/dev/null 2>&1; then
         echo "Switch CPU cstates are: disabled"
         CSTATES="processor.max_cstate=1 intel_idle.max_cstate=0"
+    elif echo "$CPUVENDOR" | grep -i 'AMD' >/dev/null 2>&1; then
+        echo "Switch CPU cstates are: disabled"
+        CSTATES="processor.max_cstate=1 amd_idle.max_cstate=0"
     else
         CSTATES=""
     fi