sw64: simplify do_entInt()

Sunway inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I56OLG



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

It has already disabled interrupt in hmcode and it's unnecessary to
disable again in do_entInt(). This way, do_entInt() is a wrapper of
handle_chip_irq(), so simplify it.

Signed-off-by: He Chuyue <hechuyue@wxiat.com>
Signed-off-by: Gu Zitao <guzitao@wxiat.com>