soc/amd/stoneyridge: Convert monotonic timer

Use the TSC for the Stoney Ridge monotonic timer.  Modern AMD
CPUs have invariant timestamp counters.  This patch brings the
feature more in line with other devices and allows the use of
typical monotonic timer functions.

BUG=chrome-os-partner:62578062

Change-Id: I07b05fbc7cdea54a45daac01954284a9fd67e42f
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/20201
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>

src/soc/amd/stoneyridge/Kconfig

@@ -34,12 +34,14 @@ config CPU_SPECIFIC_OPTIONS
 	select IOAPIC
 	select HAVE_USBDEBUG_OPTIONS
 	select HAVE_HARD_RESET
-	select LAPIC_MONOTONIC_TIMER
+	select UDELAY_TSC
+	select HAVE_MONOTONIC_TIMER
+	select TSC_MONOTONIC_TIMER
+	select TSC_CONSTANT_RATE
 	select SPI_FLASH if HAVE_ACPI_RESUME
 	select TSC_SYNC_LFENCE
 	select SOC_AMD_COMMON
 	select SOC_AMD_PI
-	select UDELAY_LAPIC
 
 config UDELAY_LAPIC_FIXED_FSB
 	int