ACPICA: Namespace: Add acpi_ns_handle_to_name()

ACPICA commit f9fe27a68a90c9d32dd3156241a5e788fb6956ea

This patch adds acpi_ns_handle_to_name() so that in the acpi_get_name():
1. Logics can be made simpler,
2. Lock held for acpi_ns_handle_to_name() can also be applied to
   acpi_ns_handle_to_pathname().
The lock might be useless (see Link 1 below), but kept as acpi_get_name()
is an external API. Except the lock correction, this patch is a functional
no-op. BZ 1182, Lv Zheng.

Link: https://github.com/acpica/acpica/commit/f9fe27a6
Link: https://bugs.acpica.org/show_bug.cgi?id=1182 [# 1]
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/acpica/acnamesp.h

@@ -291,6 +291,9 @@ char *acpi_ns_get_normalized_pathname(struct acpi_namespace_node *node,
 
 char *acpi_ns_name_of_current_scope(struct acpi_walk_state *walk_state);
 
+acpi_status
+acpi_ns_handle_to_name(acpi_handle target_handle, struct acpi_buffer *buffer);
+
 acpi_status
 acpi_ns_handle_to_pathname(acpi_handle target_handle,
 			   struct acpi_buffer *buffer, u8 no_trailing);