staging: vt6655: Rename byPreambleType field

Drop Hungarian notation prefix in `byPreambleType` member of
struct vnt_private. Change it to use snake case.

Fix issue detected by checkpatch.pl:
  CHECK: Avoid CamelCase: <byPreambleType>

Signed-off-by: Karolina Drobnik <karolinadrobnik@gmail.com>
Link: https://lore.kernel.org/r/20211018150317.9590-1-karolinadrobnik@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>