staging: vt6656: Fix CamelCase warnings in mac.h and mac.c

staging: vt6656: Fix CamelCase warnings in mac.h and mac.c

This patch fixes the checkpatch.pl warnings like:
CHECK: Avoid CamelCase: <EnCFG_BBType_a>
175: FILE: drivers/staging/vt6656/mac.h:175:
+#define EnCFG_BBType_a		0x00
and affected places in mac.c

Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/d04b36cc5446d1c996ac8bc71ff391d822cedd9d.1645477326.git.philipp.g.hortmann@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>