tools: .gitignore: Add libfdt related files

Some files are generated during libfdt build. Ignore them.

This was wrongly put in the .gitignore in the root directory before.
Now let's remove entries there and put them in the right place.

Fixes: 34e2c285 ("gitignore: add intermediates from libfdt build")
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>

.gitignore

@@ -57,14 +57,6 @@ fit-dtb.blob
 /include/config/
 /include/generated/
 
-# Since "ee95d10 fdt: Build the new python libfdt module", a number of
-# build artifacts and intermediated from the python libfdt module are
-# installed into the /tools directory.
-/tools/_libfdt.so
-/tools/libfdt.py
-/tools/libfdt.pyc
-/tools/libfdt_wrap.c
-
 # stgit generated dirs
 patches-*
 .stgit-edit.txt

tools/.gitignore

+/_libfdt.so
 /atmel_pmecc_params
 /bin2header
 /bmp_logo
@@ -16,6 +17,9 @@
 /img2srec
 /kwboot
 /lib/
+/libfdt.py
+/libfdt.pyc
+/libfdt_wrap.c
 /mips-relocs
 /mkenvimage
 /mkexynosspl