ARM: ARCH_MXC should select HAVE_CLK

All i.MX platforms support <linux/clk.h> calls and should select HAVE_CLK.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 9faccc4..e60ec54 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -454,6 +454,7 @@
 	select ARCH_MTD_XIP
 	select GENERIC_GPIO
 	select ARCH_REQUIRE_GPIOLIB
+	select HAVE_CLK
 	help
 	  Support for Freescale MXC/iMX-based family of processors