PXA: Squash extern pxa_dram_init()

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
diff --git a/board/zipitz2/zipitz2.c b/board/zipitz2/zipitz2.c
index 9e6a0d5..e72a5d9 100644
--- a/board/zipitz2/zipitz2.c
+++ b/board/zipitz2/zipitz2.c
@@ -27,6 +27,7 @@
 #include <command.h>
 #include <serial.h>
 #include <asm/arch/hardware.h>
+#include <asm/arch/pxa.h>
 #include <spi.h>
 #include <asm/io.h>
 
@@ -65,7 +66,6 @@
 	return &serial_stuart_device;
 }
 
-extern void pxa_dram_init(void);
 int dram_init(void)
 {
 	pxa_dram_init();