staging: vt6656: Clean up device_alloc_bufs

Clean up white space, comments and camel case.

pDevice -> priv
pTxContext -> tx_context
pRCB -> rcb

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>