Add reset and UART VDM support to tipd#399
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This patch adds macvdmtool-like functionality to tipd, supporting target reboot and target+local UART over USB-C (SBU mux)
Two new sysfs entries are created: /sys/class/typec/portX/device/cd321x_vdm/reboot and /sys/class/typec/portX/device/cd321x_vdm/serial
Writing to reboot sends a VDM that resets the connected device (tested by myself on M1 MBA J313AP)
Writing to serial first sends a VDM that causes the target device to enter UART mode and then puts the local CD321x device into UART mode - enabling serial communication between two M1 machines
(many thanks to chaos_princess who tested this successfully with a M1 Pro J314s as the host machine).