soc/intel/xeon_sp/skx/soc_util.c: Remove unused <cpu/cpu.h>

Change-Id: I6dd004b417c27ff0b9f7e55557a9670f927d425c
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41514
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jonathan Zhang <jonzhang@fb.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/soc/intel/xeon_sp/skx/soc_util.c

@@ -3,7 +3,6 @@
 #include <assert.h>
 #include <commonlib/sort.h>
 #include <console/console.h>
-#include <cpu/cpu.h>
 #include <cpu/x86/msr.h>
 #include <delay.h>
 #include <device/pci.h>