pvmfw: Remove old comment about unshare_all_memory

Test: -
Change-Id: I7c90f231dbf97512b01cf0aba25b45b16fc56e38
diff --git a/guest/pvmfw/src/entry.rs b/guest/pvmfw/src/entry.rs
index 2f0b391..4339513 100644
--- a/guest/pvmfw/src/entry.rs
+++ b/guest/pvmfw/src/entry.rs
@@ -144,7 +144,6 @@
         error!("Failed to unshare MMIO ranges: {e}");
         RebootReason::InternalError
     })?;
-    // Call unshare_all_memory here (instead of relying on the dtor) while UART is still mapped.
     unshare_all_memory();
 
     if cfg!(debuggable_vms_improvements) && debuggable_payload {