sw64: gpu: replace '_memset_c_io' by 'memset_io'

Sunway inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5GDKC



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

Signed-off-by: Xiong Aifei <xiongaifei@wxiat.com>

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