clocksource/drivers/arm_arch_timer: Advertise 56bit timer to the core code

mainline inclusion
from mainline-v5.16-rc1
commit 30aa08da
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4QCBG
CVE: NA

----------------------

Proudly tell the code code that we have a timer able to handle
56 bits deltas.
Signed-off-by: NMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211017124225.3018098-9-maz@kernel.orgSigned-off-by: NDaniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: NXiongfeng Wang <wangxiongfeng2@huawei.com>
Reviewed-by: NHanjun Guo <guohanjun@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/clocksource/arm_arch_timer.c

@@ -833,7 +833,7 @@ static void __arch_timer_setup(unsigned type,
 
 	clk->set_state_shutdown(clk);
 
-	clockevents_config_and_register(clk, arch_timer_rate, 0xf, 0x7fffffff);
+	clockevents_config_and_register(clk, arch_timer_rate, 0xf, CLOCKSOURCE_MASK(56));
 }
 
 static void arch_timer_evtstrm_enable(int divider)