arm, davinci: Fix build warnings for cam_enc_4xx

This patch fixes a build warning for the cam_enc_4xx board introduced by
commit d6ec0c0dfc70447cf615ae80a952da81f73f16b4:

spl.c:35:13: warning: 'gdata' defined but not used
spl.c:36:13: warning: 'bdata' defined but not used

Signed-off-by: Christian Riesch <christian.riesch@omicron.at>
Cc: Tom Rini <trini@ti.com>
Cc: Heiko Schocher <hs@denx.de>

arch/arm/cpu/arm926ejs/davinci/spl.c

@@ -29,13 +29,14 @@
 #include <malloc.h>
 #include <spi_flash.h>
 
-DECLARE_GLOBAL_DATA_PTR;
+#ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
 
+DECLARE_GLOBAL_DATA_PTR;
 /* Define global data structure pointer to it*/
 static gd_t gdata __attribute__ ((section(".data")));
 static bd_t bdata __attribute__ ((section(".data")));
 
-#ifndef CONFIG_SPL_LIBCOMMON_SUPPORT
+#else
 
 void puts(const char *str)
 {