KVM: arm/arm64: use esr_ec as trace field of kvm_exit tracepoint

euleros inclusion
category: bugfix

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The filter name 'exit_reason' is only applicable to x86, however kvm_stat use
this trace fileld to filter Guest trap info. It will fail to call
ioctl(fd, SET_FILTER, fileld_name) on a different architecture other than x86.

This patch makes arm64 use 'esr_ec' as the trace fileld of kvm_exit
tracepoint, so that kvm_stat will work.

Signed-off-by: Ying Fang <fangying1@huawei.com>
Reviewed-by: Hailiang Zhang <zhang.zhanghailiang@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>