Revert "imximage: Remove failure when no IVT offset is found"

This reverts commit b5b0e4e3.

Commit f9167573 ("imx: Create distinct pre-processed mkimage
config files") provided a proper fix for the parallel mkimage
config files build failure, so the original workaround can be
safely reverted now.
Signed-off-by: NFabio Estevam <fabio.estevam@nxp.com>
Reviewed-by: NStefano Babic <sbabic@denx.de>

tools/imximage.c

@@ -777,6 +777,11 @@ static uint32_t parse_cfg_file(struct imx_header *imxhdr, char *name)
 	(*set_dcd_rst)(imxhdr, dcd_len, name, lineno);
 	fclose(fd);
 
+	/* Exit if there is no BOOT_FROM field specifying the flash_offset */
+	if (imximage_ivt_offset == FLASH_OFFSET_UNDEFINED) {
+		fprintf(stderr, "Error: No BOOT_FROM tag in %s\n", name);
+		exit(EXIT_FAILURE);
+	}
 	return dcd_len;
 }