src: Remove unused '#include <timer.h>'

Change-Id: I57e064d26b215743a1cb06bb6605fc4fe1160876
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41491
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/skylake/cpu.c

@@ -26,7 +26,6 @@
 #include <soc/pm.h>
 #include <soc/ramstage.h>
 #include <soc/systemagent.h>
-#include <timer.h>
 
 #include "chip.h"