[ARM] pxa: make zylonite use the generic PWM backlight driver

Patch mostly by Eric Miao, minor edits by rmk.

Signed-off-by: eric miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-pxa/Kconfig b/arch/arm/mach-pxa/Kconfig
index 9c01505..b7a3281 100644
--- a/arch/arm/mach-pxa/Kconfig
+++ b/arch/arm/mach-pxa/Kconfig
@@ -116,6 +116,7 @@
 config MACH_ZYLONITE
 	bool "PXA3xx Development Platform"
 	select PXA3xx
+	select HAVE_PWM
 
 config MACH_LITTLETON
 	bool "PXA3xx Form Factor Platform (aka Littleton)"
@@ -276,6 +277,7 @@
 
 config PXA_PWM
 	tristate
+	default BACKLIGHT_PWM
 	help
 	  Enable support for PXA2xx/PXA3xx PWM controllers
 endif