staging: vt6655: Rename `uChannel` variable

Drop Hungarian notation in `uChannel` variable in
`RFvWriteWakeProgSyn` function. Change it to use snake case.

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

Signed-off-by: Karolina Drobnik <karolinadrobnik@gmail.com>
Link: https://lore.kernel.org/r/09881aacf6b399e3bce2de658133553c78c5b1ab.1634826774.git.karolinadrobnik@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>