soc/intel/xeon_sp/skx/soc_acpi.c: Remove duplicated include

Change-Id: Icf4247a0a5fb7950c69c8f229a6629a4fa6980f7
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49569
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

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

@@ -12,7 +12,6 @@
 #include <soc/acpi.h>
 #include <soc/cpu.h>
 #include <soc/iomap.h>
-#include <device/mmio.h>
 #include <soc/msr.h>
 #include <soc/nvs.h>
 #include <soc/pci_devs.h>