staging: vt6656: vnt_rf_write_embedded add reg length and IFREGCTL_REGW

The rf register always have  *_REG_LEN and IFREGCTL_REGW macros added.

*_REG_LEN is always 23(0x17) replace them with VNT_RF_REG_LEN.

Remove *_REG_LEN and IFREGCTL_REGW from tables and vnt_rf_set_txpower and
apply VNT_RF_REG_LEN and IFREGCTL_REGW in vnt_rf_write_embedded
Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vt6656/rf.h

@@ -54,6 +54,7 @@
 #define RF_MASK             0x7F
 
 #define VNT_RF_MAX_POWER    0x3f
+#define	VNT_RF_REG_LEN      0x17 /* 24 bit length */
 
 int vnt_rf_write_embedded(struct vnt_private *, u32);
 int vnt_rf_setpower(struct vnt_private *, u32, u32);