libpayload: Add Timer for sdm845

Uses ARCH64 Timer

TEST=build

Change-Id: Ic312bcf3bc7e80482b7f038e2dbc4abaaffd5956
Signed-off-by: T Michael Turney <mturney@codeaurora.org>
Reviewed-on: https://review.coreboot.org/25214
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

payloads/libpayload/drivers/timer/Kconfig

@@ -45,6 +45,11 @@ config TIMER_IPQ40XX
 	  This is the timer driver for QCA IPQ40xx based
 	  platforms.
 
+config TIMER_ARM64_ARCH
+	bool "Architecture Timer for ARM64 platforms"
+	help
+	  The cntfrq register needs to have been pre-initialized.
+
 config TIMER_RK3288
 	bool "Timer for Rockchip RK3288"