ARM: OMAP2+: Fix randconfig build warning for dm814_pllss_data

Fix warning for arch/arm/mach-omap2/prm_common.c:666:35: warning:
‘dm814_pllss_data’ defined but not used [-Wunused-variable]".

This can happen if CONFIG_SOC_TI81XX is not selected.

Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/mach-omap2/prm_common.c b/arch/arm/mach-omap2/prm_common.c
index 55acc76..5b2f513 100644
--- a/arch/arm/mach-omap2/prm_common.c
+++ b/arch/arm/mach-omap2/prm_common.c
@@ -662,7 +662,9 @@
 	.index = TI_CLKM_PRM,
 	.init = am33xx_prm_init,
 };
+#endif
 
+#ifdef CONFIG_SOC_TI81XX
 static struct omap_prcm_init_data dm814_pllss_data __initdata = {
 	.index = TI_CLKM_PLLSS,
 	.init = am33xx_prm_init,