staging: vt6656: Fix (most) sparse warnings regarding static functions/variables

This fixes sparse warnings for functions and variables, e.g.:
* drivers/staging/vt6656/card.c:69:11: warning: symbol 'cwRXBCNTSFOff'
was not declared. Should it be static?

Some warnings were false positives, such as:
* drivers/staging/vt6656/dpc.c:249:5: warning: symbol 'RXbBulkInProcessData'
was not declared. Should it be static?

Signed-off-by: Valentina Manea <valentina.manea.m@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/vt6656/card.c b/drivers/staging/vt6656/card.c
index 19d3cf4..662cfea 100644
--- a/drivers/staging/vt6656/card.c
+++ b/drivers/staging/vt6656/card.c
@@ -66,7 +66,7 @@
 //const u16 cwRXBCNTSFOff[MAX_RATE] =
 //{17, 34, 96, 192, 34, 23, 17, 11, 8, 5, 4, 3};
 
-const u16 cwRXBCNTSFOff[MAX_RATE] =
+static const u16 cwRXBCNTSFOff[MAX_RATE] =
 {192, 96, 34, 17, 34, 23, 17, 11, 8, 5, 4, 3};
 
 /*
@@ -205,7 +205,7 @@
  * Return Value: none
  *
  */
-void
+static void
 CARDvCalculateOFDMRParameter (
       u16 wRate,
       u8 byBBType,