caif: Kconfig and Makefile fixes

Use "depends on" instead of "if" in Kconfig files.
Fixed CAIF debug flag, and removed unnecessary clean-* options.

Signed-off-by: Sjur Braendeland <sjur.brandeland@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/caif/Kconfig b/drivers/net/caif/Kconfig
index 0b28e01..6f33ee4 100644
--- a/drivers/net/caif/Kconfig
+++ b/drivers/net/caif/Kconfig
@@ -2,16 +2,13 @@
 # CAIF physical drivers
 #
 
-if CAIF
-
 comment "CAIF transport drivers"
 
 config CAIF_TTY
 	tristate "CAIF TTY transport driver"
+	depends on CAIF
 	default n
 	---help---
 	The CAIF TTY transport driver is a Line Discipline (ldisc)
 	identified as N_CAIF. When this ldisc is opened from user space
 	it will redirect the TTY's traffic into the CAIF stack.
-
-endif # CAIF