RISC-V: KVM: Implement kvm_arch_vcpu_ioctl_set_guest_debug()

kvm_vm_ioctl_check_extension(): Return 1 if KVM_CAP_SET_GUEST_DEBUG is
been checked.

kvm_arch_vcpu_ioctl_set_guest_debug(): Update the guest_debug flags
from userspace accordingly. Route the breakpoint exceptions to HS mode
if the VCPU is being debugged by userspace, by clearing the
corresponding bit in hedeleg.

Initialize the hedeleg configuration in kvm_riscv_vcpu_setup_config().
Write the actual CSR in kvm_arch_vcpu_load().

Signed-off-by: Chao Du <[email protected]>
Reviewed-by: Anup Patel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Anup Patel <[email protected]>

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