Staging: vt6655: Remove C99 comments

This patch fixes the following errors identified by
checkpatch.pl:

ERROR: do not use C99 // comments
36: FILE: card.h:36:
//

ERROR: do not use C99 // comments
37: FILE: card.h:37:
// Loopback mode

ERROR: do not use C99 // comments
38: FILE: card.h:38:
//

ERROR: do not use C99 // comments
39: FILE: card.h:39:
// LOBYTE is MAC LB mode, HIBYTE is MII LB mode

ERROR: do not use C99 // comments
41: FILE: card.h:41:
#define CARD_LB_MAC             MAKEWORD(MAC_LB_INTERNAL, 0)   // PHY must ISO, avoid MAC loopback packet go out

ERROR: do not use C99 // comments
44: FILE: card.h:44:
#define DEFAULT_MSDU_LIFETIME           512  // ms

ERROR: do not use C99 // comments
45: FILE: card.h:45:
#define DEFAULT_MSDU_LIFETIME_RES_64us  8000 // 64us

ERROR: do not use C99 // comments
47: FILE: card.h:47:
#define DEFAULT_MGN_LIFETIME            8    // ms

ERROR: do not use C99 // comments
48: FILE: card.h:48:
#define DEFAULT_MGN_LIFETIME_RES_64us   125  // 64us

ERROR: do not use C99 // comments
175: FILE: card.h:175:
#endif // __CARD_H__

Signed-off-by: Nicky Chorley <ndchorley@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>