sw64: remove trap_a* and hae from pt_regs

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



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At present, glibc dumps `trap_a*` when a segmentation fault is caught,
but no user knows what they mean. That is, nobody care about them, so
remove them to reduce overhead of SAVE_COMMON_REGS.

Besides, `hae` is legacy code which should be deprecated too.

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