leds: expresswire: Don't depend on NEW_LEDS

The ExpressWire library does not depend on NEW_LEDS and selecting it
from a subsystem other than LEDs may cause Kconfig warnings:

WARNING: unmet direct dependencies detected for LEDS_EXPRESSWIRE
  Depends on [n]: NEW_LEDS [=n] && GPIOLIB [=y]
  Selected by [y]:
  - BACKLIGHT_KTD2801 [=y] && HAS_IOMEM [=y] && BACKLIGHT_CLASS_DEVICE [=y]

Move it out of the "if NEW_LEDS" block to allow selection from other
subsystems (in particular backlight) without raising this warning.

Reported-by: Arnd Bergmann <[email protected]>
Closes: https://lore.kernel.org/[email protected]
Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
Suggested-by: Daniel Thompson <[email protected]>
Fixes: 25ae5f5 ("leds: Introduce ExpressWire library")
Reviewed-by: Daniel Thompson <[email protected]>
Signed-off-by: Duje Mihanović <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Lee Jones <[email protected]>

Author: LegoLivesMatter

drivers/leds/Kconfig

@@ -6,6 +6,12 @@ config LEDS_GPIO_REGISTER
 	  As this function is used by arch code it must not be compiled as a
 	  module.
 
+# This library does not depend on NEW_LEDS and must be independent so it can be
+# selected from other subsystems (specifically backlight).
+config LEDS_EXPRESSWIRE
+	bool
+	depends on GPIOLIB
+
 menuconfig NEW_LEDS
 	bool "LED Support"
 	help