spl: spl_nand.c: Add NAND loading message

This patch adds a short message to the SPL NAND loader, which displays
the source and destinations addresses including the size of the
loaded image, like this:

U-Boot SPL 2019.04-rc3-00113-g486efd8aaf (Mar 15 2019 - 14:18:02 +0100)
Trying to boot from NAND
Loading U-Boot from 0x00040000 (size 0x000a0000) to 0x22900000

I find this message quite helpful - hopefully others do so as well.
Signed-off-by: NStefan Roese <sr@denx.de>
Cc: Heiko Schocher <hs@denx.de>
Cc: Tom Rini <trini@konsulko.com>
Reviewed-by: NTom Rini <trini@konsulko.com>

common/spl/spl_nand.c

@@ -17,6 +17,10 @@ static int spl_nand_load_image(struct spl_image_info *spl_image,
 {
 	nand_init();
 
+	printf("Loading U-Boot from 0x%08x (size 0x%08x) to 0x%08x\n",
+	       CONFIG_SYS_NAND_U_BOOT_OFFS, CONFIG_SYS_NAND_U_BOOT_SIZE,
+	       CONFIG_SYS_NAND_U_BOOT_DST);
+
 	nand_spl_load_image(CONFIG_SYS_NAND_U_BOOT_OFFS,
 			    CONFIG_SYS_NAND_U_BOOT_SIZE,
 			    (void *)CONFIG_SYS_NAND_U_BOOT_DST);