!752 arm64/mpam: modify mpam irq register error log

Merge Pull Request from: @lu-tiancheng97 
 
This patch aims to modify the mpam irq register error log.
MPAM interrupts are used to report error information and are non-functional interrupts.
The current interrupt number is set to the default value 0.
As a result, the device startup log contains the error indicating that the MPAM interrupt
registration fails, which is sensitive.
Therefore, the log level is changed to alarm. 
 
Link:https://gitee.com/openeuler/kernel/pulls/752 

Reviewed-by: Wang ShaoBo <bobo.shaobowang@huawei.com> 
Reviewed-by: Xiongfeng Wang <wangxiongfeng2@huawei.com> 
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com> 

arch/arm64/kernel/mpam/mpam_device.c

@@ -499,7 +499,7 @@ static void mpam_enable_irqs(void)
 		rc = request_irq(irq, mpam_handle_error_irq, request_flags,
 				"MPAM ERR IRQ", dev);
 		if (rc) {
-			pr_err_ratelimited("Failed to register irq %u\n", irq);
+			pr_warn_ratelimited("Not support to register irq %u\n", irq);
 			continue;
 		}