cm4000_cs: use bitrev

Cleanup using bitrev8 in cm4000_cs driver.

Cc: Harald Welte <laforge@gnumonks.org>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/char/pcmcia/Kconfig b/drivers/char/pcmcia/Kconfig
index 27c1179..f25facd 100644
--- a/drivers/char/pcmcia/Kconfig
+++ b/drivers/char/pcmcia/Kconfig
@@ -21,6 +21,7 @@
 config CARDMAN_4000
 	tristate "Omnikey Cardman 4000 support"
 	depends on PCMCIA
+	select BITREVERSE
 	help
 	  Enable support for the Omnikey Cardman 4000 PCMCIA Smartcard
 	  reader.