sw64: invoke hmcall with HMC_* macros

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



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It's better to use HMC_* macro instead of numberic constant.

This patch also adds __CALL_HMC_VOID to define hmcalls with no
return value including sflush().

Signed-off-by: He Sheng <hesheng@wxiat.com>
Reviewed-by: Cui Wei <cuiwei@wxiat.com>
Signed-off-by: Gu Zitao <guzitao@wxiat.com>