Backport subject : "Collect guest/host statistics during the redirected traps"

[yechao-w]

反合上游如下补丁，增加对应的fault exits统计，并交由guest自己处理。

e325618 RISC-V: KVM: Redirect AMO load/store access fault traps to guest
51c5895 RISC-V: KVM: Redirect instruction access fault trap to guest
2f15b5e RISC-V: KVM: Update firmware counters for various events
af79caa RISC-V: KVM: Add new exit statstics for redirected traps