amdk8: Move to implicit length patching

Change-Id: I8b4c36adaa7ea791ae1a8f7c0d059b9201b08f94
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/7332
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>

src/include/cpu/amd/powernow.h

@@ -20,6 +20,6 @@
 #ifndef POWERNOW_H
 #define POWERNOW_H
 
-int amd_generate_powernow(u32 pcontrol_blk, u8 plen, u8 onlyBSP);
+void amd_generate_powernow(u32 pcontrol_blk, u8 plen, u8 onlyBSP);
 
 #endif