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This patch will try to find capsule image from each of connected USB devices if the HwPart of CapsuleInformation is set to 0xFF. When multiple USB devices are attached, current SBL will try to find the capsule image from the device with index specified by HwPart in the CapsuleInformation option. However, it is hard to determine the USB device index order since it depends on which port the device is connected to. This patch extends the feature of "boot from multiple USB device" from OS Loader to capsule update. Verified: TGL-UP3 RVP Signed-off-by: Stanley Chang <stanley.chang@intel.com>