drivers: base: Fix Kconfig indentation

Adjust indentation from spaces to tab (+optional two spaces) as in
coding style with command like:
$ sed -e 's/^ /\t/' -i */Kconfig

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/base/firmware_loader/Kconfig

···
 	  to be used for all firmware requests which explicitly do not disable a
 	  a fallback mechanism. Firmware calls which do prohibit a fallback
 	  mechanism is request_firmware_direct(). This option is kept for
-          backward compatibility purposes given this precise mechanism can also
+	  backward compatibility purposes given this precise mechanism can also
 	  be enabled by setting the proc sysctl value to true:
 
 	       /proc/sys/kernel/firmware_config/force_sysfs_fallback