clearfog: USB autoboot on eMMC bring-up

Let's use U-Boot's distro boot configuration for auto-executing the boot
script. This requires a proper name of the file and also a partition
that is marked as bootable.

This only helps on a system that is already jumpered to booting from
UART and where the MMC memory is unpartitioned. If we're recovering from
a broken eMMC flash, this won't really help.

This setup is also not enough to auto-boot from a factory-installed
Marvell-specific U-Boot. Even with the flash disk plugged in, it fails
with a "Bad Linux ARM zImage magic!". We will therefore have to keep
booting from UART for now...

Change-Id: I25caf68e33c47ab326b6c87d3080660575d7ff10
diff --git a/board/czechlight/clearfog/patches/u-boot/boot.patch b/board/czechlight/clearfog/patches/u-boot/boot.patch
index 44c1c3e..3e3b1ba 100644
--- a/board/czechlight/clearfog/patches/u-boot/boot.patch
+++ b/board/czechlight/clearfog/patches/u-boot/boot.patch
@@ -88,7 +88,7 @@
 +CONFIG_WDT=y
 +CONFIG_WDT_ORION=y
 diff --git a/include/configs/clearfog.h b/include/configs/clearfog.h
-index bf87bac300..75926b00ed 100644
+index bf87bac300..c78dcce1a1 100644
 --- a/include/configs/clearfog.h
 +++ b/include/configs/clearfog.h
 @@ -32,6 +32,11 @@
@@ -129,7 +129,7 @@
 -	"fdtfile=" CONFIG_DEFAULT_DEVICE_TREE ".dtb\0" \
  	"console=ttyS0,115200\0" \
 -	BOOTENV
-+	"usbboot=usb start; fatload usb 0:1 ${script_addr_r} usb-boot.scr; source ${script_addr_r}\0" \
++	"usbboot=usb start; fatload usb 0:1 ${script_addr_r} boot.scr; source ${script_addr_r}\0" \
 +	"bootcmd=test -n \"${BOOT_A_LEFT}\" || setenv BOOT_A_LEFT 3;" \
 +	"test -n \"${BOOT_B_LEFT}\" || setenv BOOT_B_LEFT 3;" \
 +	"test -n \"${BOOT_ORDER}\" || setenv BOOT_ORDER \"A B\";" \