[PATCH] tile: set KBUILD_DEFCONFIG to point at a real config file

[Paul Gortmaker <paul.gortmaker@windriver.com>]

To fix this:

~/git/linux-head$ make defconfig
*** Default configuration is based on 'tile_defconfig'
***
*** Can't find default configuration "arch/tile/configs/tile_defconfig"!
***
make[1]: *** [defconfig] Error 1
make: *** [defconfig] Error 2

There is no need to use $ARCH in the tile/Makefile, since if we are
in there, we know ARCH must be tile.  Use the GX as the defconfig,
as that is what is used in linux-next.

Cc: Chris Metcalf <cmetcalf@tilera.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/arch/tile/Makefile b/arch/tile/Makefile
index 5015144..89f2310 100644
--- a/arch/tile/Makefile
+++ b/arch/tile/Makefile
@@ -34,7 +34,7 @@ LIBGCC_PATH     := \
   $(shell $(CC) $(KBUILD_CFLAGS) $(KCFLAGS) -print-libgcc-file-name)
 
 # Provide the path to use for "make defconfig".
-KBUILD_DEFCONFIG := $(ARCH)_defconfig
+KBUILD_DEFCONFIG := tilegx_defconfig
 
 # Used as a file extension when useful, e.g. head_$(BITS).o
 # Not needed for (e.g.) "$(CC) -m32" since the compiler automatically
-- 
1.7.9.1