Remove AMD's "Release Content" doxygen from coreboot files

These comments are left over and are not relevent in the coreboot
code, but created a new section titled "Release Content" in the
doxygen documentation produced by the coreboot code.  In an effort
to clean up the output, I'm removing these doxygen comments.

Change-Id: I4d7be3313a2ab6c140b4f3afe70dffc4abba7bca
Signed-off-by: Martin Roth <martin.roth@se-eng.com>
Reviewed-on: http://review.coreboot.org/8069
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>

src/southbridge/amd/cimx/sb800/Amd.h

@@ -7,10 +7,6 @@
  *
  * Contains AMD AGESA/CIMx core interface
  *
- * @xrefitem bom "File Content Label" "Release Content"
- * @e project:      AGESA
- * @e sub-project:  Include
- * @e \$Revision:$   @e \$Date:$
  */
 /*
  *****************************************************************************

src/southbridge/amd/cimx/sb900/Amd.h

@@ -7,10 +7,6 @@
  *
  * Contains AMD AGESA/CIMx core interface
  *
- * @xrefitem bom "File Content Label" "Release Content"
- * @e project:      AGESA
- * @e sub-project:  Include
- * @e \$Revision:$   @e \$Date:$
  */
 /*
  *****************************************************************************