ARM: imx: make all pin lists const and signed, move to .init where possible

Making the lists signed fixes sparse warnings like:

	arch/arm/mach-imx/mach-mx27_3ds.c:94:31: warning: incorrect type in argument 1 (different signedness)
	arch/arm/mach-imx/mach-mx27_3ds.c:94:31:    expected int const *pin_list
	arch/arm/mach-imx/mach-mx27_3ds.c:94:31:    got unsigned int static [toplevel] *<noident>

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
diff --git a/arch/arm/mach-imx/mach-mx27ads.c b/arch/arm/mach-imx/mach-mx27ads.c
index 6be6033..1a33288 100644
--- a/arch/arm/mach-imx/mach-mx27ads.c
+++ b/arch/arm/mach-imx/mach-mx27ads.c
@@ -66,7 +66,7 @@
 /* to determine the correct external crystal reference */
 #define CKIH_27MHZ_BIT_SET      (1 << 3)
 
-static unsigned int mx27ads_pins[] = {
+static const int mx27ads_pins[] __initconst = {
 	/* UART0 */
 	PE12_PF_UART1_TXD,
 	PE13_PF_UART1_RXD,