PXA: Squash extern pxa_dram_init()

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
diff --git a/board/lubbock/lubbock.c b/board/lubbock/lubbock.c
index f791c5b..e9e6bda 100644
--- a/board/lubbock/lubbock.c
+++ b/board/lubbock/lubbock.c
@@ -27,6 +27,7 @@
 
 #include <common.h>
 #include <netdev.h>
+#include <asm/arch/pxa.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -56,7 +57,6 @@
 	return 0;
 }
 
-extern void pxa_dram_init(void);
 int dram_init(void)
 {
 	pxa_dram_init();