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/configs/config.cheza

@@ -0,0 +1,3 @@
+CONFIG_LP_ARCH_ARM64=y
+# CONFIG_LP_CURSES is not set
+CONFIG_LP_TIMER_ARM64_ARCH=y