update AMD powerflags comments

from http://www.flounder.com/cpuid80000007amd.gif
and http://support.amd.com/us/Embedded_TechDocs/25481.pdf

Signed-off-by: Thorsten Glaser <t.glaser@tarent.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
1 file changed