powerpc/kvm: Remove comment related to moving PMU code to perf subsystem

Commit aabcaf6 ("KVM: PPC: Book3S HV P9: Move host OS save/restore
functions to  built-in") added a comment in switch_pmu_to_guest
function, indicating possibility of moving PMU handling code
to perf subsystem. But perf subsystem code compilation depends upon
the enablement of CONFIG_PERF_EVENTS whereas, kvm code don't have
any dependency on this config.
Patch remove this comment as switch_pmu_to_guest functionality is
needed even if perf subsystem is disabled.

Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220711034927.213192-2-kjain@linux.ibm.com

Author: kjain101

arch/powerpc/kvm/book3s_hv_p9_perf.c

@@ -44,12 +44,6 @@ void switch_pmu_to_guest(struct kvm_vcpu *vcpu,
 
 	/* Save host */
 	if (ppc_get_pmu_inuse()) {
-		/*
-		 * It might be better to put PMU handling (at least for the
-		 * host) in the perf subsystem because it knows more about what
-		 * is being used.
-		 */
-
 		/* POWER9, POWER10 do not implement HPMC or SPMC */
 
 		host_os_sprs->mmcr0 = mfspr(SPRN_MMCR0);