board_inspector: add conversion to hex string from buffer fields

Occasionally buffer fields (which are typically integers) are converted to
hexadecimal strings for debugging purposes. This patch adds the conversion
to suppress interpretation errors of these debugging calls.

This patch is added in v3 of the series.

Tracked-On: #6287
Signed-off-by: Junjie Mao <junjie.mao@intel.com>

misc/config_tools/board_inspector/acpiparser/aml/datatypes.py

@@ -221,6 +221,9 @@ class BufferField(Object):
     def to_string(self):
         return f"BufferField({self.__field})"
 
+    def to_hex_string(self):
+        return String(hex(self.get())[2:])
+
 # DebugObject
 
 class Device(Object):