powerpc/64s: Remove lost/old comment

The bulk of this was moved/reworded in:
  57f26649 ("powerpc: Use gas sections for arranging exception vectors")

And now appears around line 700 in arch/powerpc/kernel/exceptions-64s.S.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220928130941.1732818-1-mpe@ellerman.id.au

arch/powerpc/kernel/exceptions-64s.S

@@ -3070,16 +3070,6 @@ EXPORT_SYMBOL(do_uaccess_flush)
 MASKED_INTERRUPT
 MASKED_INTERRUPT hsrr=1
 
-	/*
-	 * Relocation-on interrupts: A subset of the interrupts can be delivered
-	 * with IR=1/DR=1, if AIL==2 and MSR.HV won't be changed by delivering
-	 * it.  Addresses are the same as the original interrupt addresses, but
-	 * offset by 0xc000000000004000.
-	 * It's impossible to receive interrupts below 0x300 via this mechanism.
-	 * KVM: None of these traps are from the guest ; anything that escalated
-	 * to HV=1 from HV=0 is delivered via real mode handlers.
-	 */
-
 USE_FIXED_SECTION(virt_trampolines)
 	/*
 	 * All code below __end_soft_masked is treated as soft-masked. If