[firmware] Fix critical security vulnerability in usb message handling
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v5.5.0
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This release fixes a buffer underflow in usb_rx_helper. Since that code is shared with the bootloader, this release is coupled with a bootloader update.
For more information, see: https://www.keepkey.com/2018/06/25/security-update-release-notes-bootloade-v-1-1-0-firmware-v5-5-0/