Remove valueless definition of hard-selected RAMFS option

Since CONFIG_RAMFS is currently hard-selected to "y", and since
Documentation/filesystems/ramfs-rootfs-initramfs.txt reads as follows:

"The amount of code required to implement ramfs is tiny, because all the
work is done by the existing Linux caching infrastructure.  Basically,
you're mounting the disk cache as a filesystem.  Because of this, ramfs is
not an optional component removable via menuconfig, since there would be
negligible space savings."

It seems pointless to leave this as a Kconfig entry.

Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/ramfs/Makefile b/fs/ramfs/Makefile
index 5a0236e..c71e65d 100644
--- a/fs/ramfs/Makefile
+++ b/fs/ramfs/Makefile
@@ -2,7 +2,7 @@
 # Makefile for the linux ramfs routines.
 #
 
-obj-$(CONFIG_RAMFS) += ramfs.o
+obj-y += ramfs.o
 
 file-mmu-y := file-nommu.o
 file-mmu-$(CONFIG_MMU) := file-mmu.o