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>
diff --git a/drivers/mtd/nand/nand.c b/drivers/mtd/nand/nand.c
index 3ea2dcf..168bac6 100644
--- a/drivers/mtd/nand/nand.c
+++ b/drivers/mtd/nand/nand.c
@@ -131,6 +131,11 @@
 }
 #endif
 
+unsigned long nand_size(void)
+{
+	return total_nand_size;
+}
+
 void nand_init(void)
 {
 	static int initialized;
@@ -152,8 +157,6 @@
 		nand_init_chip(i);
 #endif
 
-	printf("%lu MiB\n", total_nand_size / 1024);
-
 #ifdef CONFIG_SYS_NAND_SELECT_DEVICE
 	/*
 	 * Select the chip in the board/cpu specific driver