PWM: atmel: allow building for AVR32

The Atmel PWM IP can be found on avr32 chips. This allows selecting and building
the driver on avr32.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
index 4ad7b89..331dfca4 100644
--- a/drivers/pwm/Kconfig
+++ b/drivers/pwm/Kconfig
@@ -43,7 +43,7 @@
 
 config PWM_ATMEL
 	tristate "Atmel PWM support"
-	depends on ARCH_AT91
+	depends on ARCH_AT91 || AVR32
 	help
 	  Generic PWM framework driver for Atmel SoC.