src: Drop unused <cpu/x86/tsc.h> include

Found using:
diff <(git grep -l '#include <cpu/x86/tsc.h>' -- src/) <(git grep -l 'TSC_SYNC\|tsc_struct\|rdtsc\|tsc_t\|multiply_to_tsc\|rdtscll\|tsc_to_uint64\|tsc_freq_mhz\|tsc_constant_rate' -- src/)|grep '<'

Change-Id: Id090e232a96323adb8d9a24b81f7ae5669248f57
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42393
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/drivers/pc80/pc/spkmodem.c

@@ -2,7 +2,6 @@
 
 #include <arch/io.h>
 #include <console/spkmodem.h>
-#include <cpu/x86/tsc.h>
 
 #define SPEAKER_PIT_FREQUENCY		0x1234dd
 

src/soc/intel/baytrail/acpi.c

@@ -10,7 +10,6 @@
 #include <cpu/x86/smm.h>
 #include <types.h>
 #include <cpu/x86/msr.h>
-#include <cpu/x86/tsc.h>
 #include <cpu/intel/turbo.h>
 
 #include <soc/acpi.h>

src/soc/intel/braswell/acpi.c

@@ -10,7 +10,6 @@
 #include <cpu/intel/turbo.h>
 #include <cpu/x86/msr.h>
 #include <cpu/x86/smm.h>
-#include <cpu/x86/tsc.h>
 #include <device/pci.h>
 #include <ec/google/chromeec/ec.h>
 #include <drivers/intel/gma/opregion.h>

src/soc/intel/broadwell/acpi.c

@@ -12,7 +12,6 @@
 #include <string.h>
 #include <arch/cpu.h>
 #include <cpu/x86/msr.h>
-#include <cpu/x86/tsc.h>
 #include <cpu/intel/turbo.h>
 #include <ec/google/chromeec/ec.h>
 #include <vendorcode/google/chromeos/gnvs.h>

src/soc/intel/broadwell/refcode.c

@@ -5,7 +5,6 @@
 #include <cbmem.h>
 #include <console/console.h>
 #include <console/streams.h>
-#include <cpu/x86/tsc.h>
 #include <program_loading.h>
 #include <rmodule.h>
 #include <stage_cache.h>

src/soc/intel/skylake/acpi.c

@@ -10,7 +10,6 @@
 #include <console/console.h>
 #include <cpu/x86/smm.h>
 #include <cpu/x86/msr.h>
-#include <cpu/x86/tsc.h>
 #include <cpu/intel/common/common.h>
 #include <cpu/intel/turbo.h>
 #include <ec/google/chromeec/ec.h>