staging: vt6655: Convert macro MACvDisableBarkerPreambleMd

Convert macro MACvDisableBarkerPreambleMd to static function which calls
the common static function vt6655_mac_clear_bits. This saves
codelines and multiline macros are not liked by kernel community.
Function name is also changed to avoid CamelCase which is not accepted
by checkpatch.pl and to clean up namespace.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/2a1d67762d9ecf3f30f3e293ad6ab997ad278b84.1659892671.git.philipp.g.hortmann@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vt6655/device_main.c

@@ -248,6 +248,12 @@ static void vt6655_mac_en_barker_preamble_md(void __iomem *iobase)
 {
 	vt6655_mac_set_bits(iobase, ENCFG_BARKERPREAM);
 }
+
+static void vt6655_mac_dis_barker_preamble_md(void __iomem *iobase)
+{
+	vt6655_mac_clear_bits(iobase, ENCFG_BARKERPREAM);
+}
+
 /*
  * Initialisation of MAC & BBP registers
  */
@@ -1486,7 +1492,7 @@ static void vnt_bss_info_changed(struct ieee80211_hw *hw,
 			vt6655_mac_en_barker_preamble_md(priv->port_offset);
 			priv->preamble_type = true;
 		} else {
-			MACvDisableBarkerPreambleMd(priv->port_offset);
+			vt6655_mac_dis_barker_preamble_md(priv->port_offset);
 			priv->preamble_type = false;
 		}
 	}

drivers/staging/vt6655/mac.h

@@ -543,14 +543,6 @@
 #define MACvSelectPage1(iobase)				\
 	iowrite8(1, iobase + MAC_REG_PAGE1SEL)
 
-#define MACvDisableBarkerPreambleMd(iobase)				\
-do {									\
-	unsigned long dwOrgValue;					\
-	dwOrgValue = ioread32(iobase + MAC_REG_ENCFG);			\
-	dwOrgValue = dwOrgValue & ~ENCFG_BARKERPREAM;			\
-	iowrite32((u32)dwOrgValue, iobase + MAC_REG_ENCFG);		\
-} while (0)
-
 #define MACvSetBBType(iobase, byTyp)					\
 do {									\
 	unsigned long dwOrgValue;					\