cpu/amd/model_10xxx: Remove UPDATE_CPU_MICROCODE option

This option is now deperecated by loading microcode updates from cbfs.
Remove this option in anticipation of implementing CBFS loading for
AMD cpus. Removing it beforehand results in less patch overhead.

Change-Id: Ibdef7843db686734e2b6b1568692720fb543b240
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-on: http://review.coreboot.org/8322
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Timothy Pearson <tpearson@raptorengineeringinc.com>

src/include/cpu/amd/microcode.h

@@ -3,11 +3,7 @@
 
 void amd_update_microcode(void *microcode_updates, unsigned processor_rev_id);
 void model_fxx_update_microcode(unsigned cpu_deviceid);
-
-#if CONFIG_UPDATE_CPU_MICROCODE
 void update_microcode(u32 processor_rev_id);
-#else
-#define update_microcode(x)
-#endif
+
 #endif /* CPU_AMD_MICROCODE_H */