src: Remove unused '#include <cpu/cpu.h>'

Change-Id: Ibcb1cafe36c255b4c5bd0a4faeedb95e91048709
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36372
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>

src/cpu/intel/common/fsb.c

@@ -12,7 +12,6 @@
  */
 
 #include <arch/early_variables.h>
-#include <cpu/cpu.h>
 #include <cpu/x86/msr.h>
 #include <cpu/x86/tsc.h>
 #include <cpu/intel/speedstep.h>