cpu/intel/model_206ax: Use tsc monotonic timer

Switch from lapic to tsc.

Allows timestamps to be used in coreboot, as there's a reference
clock available to calculate correct time units.

Clean Kconfig, remove duplicated lapic code and include tsc dir for
LGA1155 boards.

Tested on Lenovo T430.

Change-Id: I849ca2b3908116d9d22907039cd6e4464444b1d1
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/20044
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/cpu/intel/model_206ax/Kconfig

@@ -14,12 +14,13 @@ config CPU_SPECIFIC_OPTIONS
 	select ARCH_RAMSTAGE_X86_32
 	select SMP
 	select SSE2
-	select UDELAY_LAPIC
+	select UDELAY_TSC
+	select TSC_CONSTANT_RATE
+	select TSC_MONOTONIC_TIMER
 	select SMM_TSEG
 	select SUPPORT_CPU_UCODE_IN_CBFS
 	#select AP_IN_SIPI_WAIT
 	select TSC_SYNC_MFENCE
-	select LAPIC_MONOTONIC_TIMER
 	select CPU_INTEL_COMMON
 
 config BOOTBLOCK_CPU_INIT