lshore: use CONFIG_USB_BOOT_FIRST

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>

configs/lshore_dl_defconfig

 CONFIG_ARM=y
 CONFIG_ARCH_MX6=y
 CONFIG_SYS_TEXT_BASE=0x17800000
+CONFIG_USB_BOOT_FIRST=y
 CONFIG_TARGET_LSHORE=y
 CONFIG_ENV_VARS_UBOOT_CONFIG=y
 CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/boundary/lshore/lshore_dl.cfg,MX6DL,DDR_MB=1024,DEFCONFIG=\"lshore_dl\""

configs/lshore_solo_defconfig

 CONFIG_ARM=y
 CONFIG_ARCH_MX6=y
 CONFIG_SYS_TEXT_BASE=0x17800000
+CONFIG_USB_BOOT_FIRST=y
 CONFIG_TARGET_LSHORE=y
 CONFIG_ENV_VARS_UBOOT_CONFIG=y
 CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/boundary/lshore/lshore_solo.cfg,MX6S,DDR_MB=512,DEFCONFIG=\"lshore_solo\""

include/configs/lshore.h

@@ -28,9 +28,6 @@
 #define BD_MMC_UMS_DISKS "0"
 
 #undef CONFIG_SYS_BOARD
-#define BOOT_TARGET_DEVICES(func) \
-	DISTRO_BOOT_DEV_USB(func) \
-	DISTRO_BOOT_DEV_MMC(func)
 
 #include "boundary.h"
 #define CONFIG_EXTRA_ENV_SETTINGS BD_BOUNDARY_ENV_SETTINGS \