KVM: PPC: Book3S HV: remove extraneous asterisk from rm_host_ipi_action() comment

kernel test robot reported kernel-doc warning for rm_host_ipi_action():

   arch/powerpc/kvm/book3s_hv_rm_xics.c:887: warning: This comment starts with '/**', but isn't a kernel-doc comment.
    * Host Operations poked by RM KVM

Since the function is static, remove the extraneous (second) asterisk at
the head of function comment.

Fixes: 0c2a6606 ("KVM: PPC: Book3S HV: Host side kick VCPU when poked by real-mode KVM")
Reported-by: Nkernel test robot <lkp@intel.com>
Signed-off-by: NBagas Sanjaya <bagasdotme@gmail.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/linux-doc/202204252334.Cd2IsiII-lkp@intel.com/
Link: https://lore.kernel.org/r/20220506070747.16309-1-bagasdotme@gmail.com

arch/powerpc/kvm/book3s_hv_rm_xics.c

@@ -883,7 +883,7 @@ long kvmppc_deliver_irq_passthru(struct kvm_vcpu *vcpu,
 
 /*  --- Non-real mode XICS-related built-in routines ---  */
 
-/**
+/*
  * Host Operations poked by RM KVM
  */
 static void rm_host_ipi_action(int action, void *data)