drivers: bus: simple-pm-bus: remove MODULE_LICENSE in non-modules

Since commit 8b41fc44 ("kbuild: create modules.builtin without
Makefile.modbuiltin or tristate.conf"), MODULE_LICENSE declarations
are used to identify modules. As a consequence, uses of the macro
in non-modules will cause modprobe to misidentify their containing
object file as a module when it is not (false positives), and modprobe
might succeed rather than failing with a suitable error message.

So remove it in the files in this commit, none of which can be built as
modules.
Signed-off-by: Nick Alcock <nick.alcock@oracle.com>
Suggested-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: linux-modules@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: Hitomi Hasegawa <hasegawa-hitomi@fujitsu.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>

drivers/bus/simple-pm-bus.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Simple Power-Managed Bus Driver
  *
@@ -138,4 +139,3 @@ module_platform_driver(simple_pm_bus_driver);
 
 MODULE_DESCRIPTION("Simple Power-Managed Bus Driver");
 MODULE_AUTHOR("Geert Uytterhoeven <geert+renesas@glider.be>");
-MODULE_LICENSE("GPL v2");