firmware_loader: move CONFIG_FW_LOADER_USER_HELPER switch to Makefile

The whole code of fallback_table.c is surrounded by #ifdef of
CONFIG_FW_LOADER_USER_HELPER.

Move the CONFIG_FW_LOADER_USER_HELPER switch to Makefile so that
it is not compiled at all when this CONFIG option is disabled.

I also removed the confusing comment, "Module or buit-in [sic]".
CONFIG_FW_LOADER_USER_HELPER is a boolean option.
(If it were a module, CONFIG_FW_LOADER_USER_HELPER_MODULE would
be defined instead.)

Signed-off-by: Masahiro Yamada <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/base/firmware_loader/Makefile

···
 # SPDX-License-Identifier: GPL-2.0
 # Makefile for the Linux firmware loader
 
-obj-y			:= fallback_table.o
+obj-$(CONFIG_FW_LOADER_USER_HELPER) += fallback_table.o
 obj-$(CONFIG_FW_LOADER)	+= firmware_class.o
 firmware_class-objs := main.o
 firmware_class-$(CONFIG_FW_LOADER_USER_HELPER) += fallback.o

drivers/base/firmware_loader/fallback_table.c

···
  * firmware fallback configuration table
  */
 
-/* Module or buit-in */
-#ifdef CONFIG_FW_LOADER_USER_HELPER
-
 static unsigned int zero;
 static unsigned int one = 1;
 
···
 	{ }
 };
 EXPORT_SYMBOL_GPL(firmware_config_table);
-
-#endif