[installer] Add CSTATE configuration for the AMD CPU.

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#### Why I did it
Add CSTATE configuration for the AMD CPU to disable CPU idling.
Related to: sonic-net#16339

##### Work item tracking
- Microsoft ADO **(number only)**:

#### How I did it
Add `processor.max_cstate=1 amd_idle.max_cstate=0` to installer default grub config.

#### How to verify it
Boot the image. Verify the added option are present in `cat /proc/cmdline` command output.

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Author: mssonicbld

installer/default_platform.conf

@@ -482,6 +482,9 @@ 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