arm64/mpam: modify mpam irq register error log

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I71UGQ


CVE: NA

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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.

Signed-off-by: Tiancheng Lu <lutiancheng5@huawei.com>