boards: Remove USB VID/PID from tinytile

According to a conversation with @carlescufi and @finikorg, the
zephyr codebase should only use the Linux Foundation USB vendor
ID. The USB vendor IDs and product IDs in the board definitions
are an obsolete leftover from old code and no longer needed.

Signed-off-by: Iván Sánchez Ortega <ivan@sanchezortega.es>