omap4: Export jedec sdram timings

Individual boards might provide their own emif_get_device_timings function and
use the jedec timings in their own way, hence those have to be exported.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>

arch/arm/cpu/armv7/omap4/emif.c

@@ -96,7 +96,7 @@ static const struct lpddr2_ac_timings const*
 	&timings_jedec_400_mhz
 };
 
-static const struct lpddr2_device_timings jedec_default_timings = {
+const struct lpddr2_device_timings jedec_default_timings = {
 	.ac_timings = jedec_ac_timings,
 	.min_tck = &min_tck_jedec
 };

arch/arm/include/asm/arch-omap4/sys_proto.h

@@ -31,7 +31,9 @@ extern const struct lpddr2_device_details elpida_2G_S4_details;
 extern const struct lpddr2_device_details elpida_4G_S4_details;
 #endif
 
-#ifndef CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS
+#ifdef CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS
+extern const struct lpddr2_device_timings jedec_default_timings;
+#else
 extern const struct lpddr2_device_timings elpida_2G_S4_timings;
 #endif