Make /dev/mem configurable, as we don't want it.

Signed-off-by: Brian Swetland <swetland@google.com>
diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index ee94686..d4ef147 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -6,6 +6,19 @@
 
 source "drivers/tty/Kconfig"
 
+config DEVMEM
+	bool "Memory device driver"
+	default y
+	help
+	  The memory driver provides two character devices, mem and kmem, which
+	  provide access to the system's memory. The mem device is a view of
+	  physical memory, and each byte in the device corresponds to the
+	  matching physical address. The kmem device is the same as mem, but
+	  the addresses correspond to the kernel's virtual address space rather
+	  than physical memory. These devices are standard parts of a Linux
+	  system and most users should say Y here. You might say N if very
+	  security conscience or memory is tight.
+
 config DEVKMEM
 	bool "/dev/kmem virtual device support"
 	default y