i2c: hisi: Only handle the interrupt of the driver's transfer

driver inclusion
category: bugfix
busgzilla: https://gitee.com/openeuler/kernel/issues/I7C6O5


CVE: NA

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The controller may be shared with other port, for example the firmware.
Handle the interrupt from other sources will cause crash since some
data are not initialized. So only handle the interrupt of the driver's
transfer and discard others.

Fixes: d62fbdb9 ("i2c: add support for HiSilicon I2C controller")
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>