ARM: s3c24xx: make H1940BT depend on RFKILL

Bluetooth is only supported when network support is part of the kernel,
so it is a bit pointless to build the hi1940-bt support without networking.
If we try anyway, we get a Kconfig warning:

warning: (TOSA_BT && H1940BT) selects RFKILL which has unmet direct dependencies (NET)

This turns the 'select' into 'depends on' as Krzysztof suggested when
I first sent a fix.
Suggested-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://patchwork.kernel.org/patch/8164161/Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

arch/arm/mach-s3c24xx/Kconfig

@@ -229,7 +229,7 @@ config ARCH_H1940
 config H1940BT
 	tristate "Control the state of H1940 bluetooth chip"
 	depends on ARCH_H1940
-	select RFKILL
+	depends on RFKILL
 	help
 	  This is a simple driver that is able to control
 	  the state of built in bluetooth chip on h1940.