xen/pciback: Remove the DEBUG option.

The latter is easily fixed - by the developer compiling the
module with -DDEBUG. And during runtime - the loglvl provides
quite a lot of useful data.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

drivers/xen/Kconfig

@@ -139,13 +139,4 @@ config XEN_PCIDEV_BACKEND_PASS
 
 endchoice
 
-config XEN_PCIDEV_BE_DEBUG
-	bool "Xen PCI Backend Debugging"
-	depends on XEN_PCIDEV_BACKEND
-	default n
-	help
-	  Allows to observe all of the traffic from the frontend/backend
-	  when reading and writting to the configuration registers.
-	  If in doubt, say no.
-
 endmenu

drivers/xen/xen-pciback/Makefile

@@ -6,7 +6,3 @@ xen-pciback-y += conf_space.o conf_space_header.o \
 		 conf_space_quirks.o
 xen-pciback-$(CONFIG_XEN_PCIDEV_BACKEND_VPCI) += vpci.o
 xen-pciback-$(CONFIG_XEN_PCIDEV_BACKEND_PASS) += passthrough.o
-
-ifeq ($(CONFIG_XEN_PCIDEV_BE_DEBUG),y)
-EXTRA_CFLAGS += -DDEBUG
-endif