KVM: arm64: Fix {fp_asimd,sve}_exit_stat manipulation

virt inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I65EGT


CVE: NA

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Currently fp_asimd_exit_stat is accumulated for *both* FP/ASIMD and SVE
traps so that user can not distinguish between these two via debugfs.

Fix the manipulation for both exception classes.

Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
Reviewed-by: Keqian Zhu <zhukeqian1@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>