boards: nucleo: tag some st boards to test for "usbd"

Add the usbd test tag to few ST boards, this should be picking a board
for every variation of the HAL file (checked for #define USBD_FS_SPEED),
so it should catch any inconsistencies between HALs.

There should be one for each of: f0 f1 f2 f3 f4 f7 g0 g4 h5 h7 l0 l4
l5 u5 wb.

Nothing for l1, can't find any boards with a USB port.

Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>