nmhw: update emmc device names

- kernel 4 uses mmcblk1 instead of mmcblk0
- update documentation accordingly

board/nm/netbird/board.c

@@ -400,7 +400,7 @@ int board_late_init(void)
 		boot_partition = 0;
 	}
 
-	/* mmcblk0p1 => root0, mmcblk0p2 => root1 so +1 */
+	/* mmcblk1p1 => root0, mmcblk1p2 => root1 so +1 */
 	setenv_ulong("root_part", boot_partition + 1);
 
 	check_reset_button();

board/nm/netbird_v2/board.c

@@ -665,7 +665,7 @@ int board_late_init(void)
 		boot_partition = 0;
 	}
 
-	/* mmcblk0p1 => root0, mmcblk0p2 => root1 so +1 */
+	/* mmcblk1p1 => root0, mmcblk1p2 => root1 so +1 */
 	setenv_ulong("root_part", boot_partition + 1);
 
 	check_reset_button();

board/nm/nrhw20/board.c

@@ -579,7 +579,7 @@ static void set_root_partition(void)
 		boot_partition = 0;
 	}
 
-	/* mmcblk0p1 => root0, mmcblk0p2 => root1 so +1 */
+	/* mmcblk1p1 => root0, mmcblk1p2 => root1 so +1 */
 	setenv_ulong("root_part", boot_partition + 1);
 }
 

board/nm/nrhw24/board.c

@@ -601,7 +601,7 @@ static void set_root_partition(void)
 		boot_partition = 0;
 	}
 
-	/* mmcblk0p1 => root0, mmcblk0p2 => root1 so +1 */
+	/* mmcblk1p1 => root0, mmcblk1p2 => root1 so +1 */
 	setenv_ulong("root_part", boot_partition + 1);
 }
 

include/configs/am335x_netbird.h

@@ -49,7 +49,7 @@
 	"kernel_addr=0x80000000\0" \
 	"load_addr=0x83000000\0" \
 	"root_part=1\0" /* Default root partition, overwritte in board/mv_ebu/a38x/nbhw14_env.c */ \
-	"add_sd_bootargs=setenv bootargs $bootargs root=/dev/mmcblk0p$root_part rootfstype=ext4 console=ttyO0,115200 rootwait earlyprintk\0" \
+	"add_sd_bootargs=setenv bootargs $bootargs root=/dev/mmcblk1p$root_part rootfstype=ext4 console=ttyO0,115200 rootwait earlyprintk\0" \
 	"add_version_bootargs=setenv bootargs $bootargs\0" \
 	"fdt_skip_update=yes\0" \
     "ethprime=cpsw\0" \