dm: Avoid accessing seq directly

At present various drivers etc. access the device's 'seq' member directly.
This makes it harder to change the meaning of that member. Change access
to go through a function instead.

The drivers/i2c/lpc32xx_i2c.c file is left unchanged for now.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/board/xilinx/versal/board.c b/board/xilinx/versal/board.c
index 912c114..2782a34 100644
--- a/board/xilinx/versal/board.c
+++ b/board/xilinx/versal/board.c
@@ -153,9 +153,9 @@
 			puts("Boot from EMMC but without SD1 enabled!\n");
 			return -1;
 		}
-		debug("mmc1 device found at %p, seq %d\n", dev, dev->seq);
+		debug("mmc1 device found at %p, seq %d\n", dev, dev_seq(dev));
 		mode = "mmc";
-		bootseq = dev->seq;
+		bootseq = dev_seq(dev);
 		break;
 	case SD_MODE:
 		puts("SD_MODE\n");
@@ -164,10 +164,10 @@
 			puts("Boot from SD0 but without SD0 enabled!\n");
 			return -1;
 		}
-		debug("mmc0 device found at %p, seq %d\n", dev, dev->seq);
+		debug("mmc0 device found at %p, seq %d\n", dev, dev_seq(dev));
 
 		mode = "mmc";
-		bootseq = dev->seq;
+		bootseq = dev_seq(dev);
 		break;
 	case SD1_LSHFT_MODE:
 		puts("LVL_SHFT_");
@@ -179,10 +179,10 @@
 			puts("Boot from SD1 but without SD1 enabled!\n");
 			return -1;
 		}
-		debug("mmc1 device found at %p, seq %d\n", dev, dev->seq);
+		debug("mmc1 device found at %p, seq %d\n", dev, dev_seq(dev));
 
 		mode = "mmc";
-		bootseq = dev->seq;
+		bootseq = dev_seq(dev);
 		break;
 	default:
 		mode = "";