pwm: bcm-iproc: Update dependencies for compile-test

Add dependency on COMMON_CLK and allow COMPILE_TEST for broader compile
coverage. Default to Y for IPROC SoCs. This allows the driver to simply
be enabled by selecting PWM.

Signed-off-by: Scott Branden <scott.branden@broadcom.com>
Reviewed-by: Ray Jui <ray.jui@broadcom.com>
[thierry.reding@gmail.com: reword commit message]
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/pwm/Kconfig

@@ -76,7 +76,9 @@ config PWM_ATMEL_TCB
 
 config PWM_BCM_IPROC
 	tristate "iProc PWM support"
-	depends on ARCH_BCM_IPROC
+	depends on ARCH_BCM_IPROC || COMPILE_TEST
+	depends on COMMON_CLK
+	default ARCH_BCM_IPROC
 	help
 	  Generic PWM framework driver for Broadcom iProc PWM block. This
 	  block is used in Broadcom iProc SoC's.