cmd: script_update: Scan available usb devices but not only dev 0

If we use 'sdcard reader + sdcard' as a udisk, there are two
mass storage and usb dev 1 may be the target boot device.

Signed-off-b

cmd: script_update: Scan available usb devices but not only dev 0

If we use 'sdcard reader + sdcard' as a udisk, there are two
mass storage and usb dev 1 may be the target boot device.

Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
Change-Id: I776f997953ad9fc9fab357553303e30dc41952b5

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