mtd: nand: remove nand size print from nand_init function

Add nand_size() function to move the nand size print into initr_nand().
Remove nand size print from nand_init() to allow other function to call
nand_init() without printing nand size.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>

include/nand.h

@@ -28,6 +28,7 @@
 #endif
 
 extern void nand_init(void);
+unsigned long nand_size(void);
 
 #include <linux/compat.h>
 #include <linux/mtd/mtd.h>