Update .gitignore files

Filter out all the generated bits from git revision control

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

.gitignore

@@ -5,5 +5,8 @@
 *~
 *.tab.[ch]
 lex.yy.c
-dtc
+*.lex.c
-ftdump
+/dtc
+/ftdump
+/convert-dtsv0
+/version_gen.h

tests/.gitignore

@@ -0,0 +1,47 @@
+*.dtb
+*.dtb.test.dts
+*.dts.test.s
+/add_subnode_with_nops
+/asm_tree_dump
+/boot-cpuid
+/del_node
+/del_property
+/dtbs_equal_ordered
+/dumptrees
+/extra-terminating-null
+/find_property
+/get_alias
+/get_mem_rsv
+/get_name
+/get_path
+/get_phandle
+/getprop
+/incbin
+/mangle-layout
+/move_and_save
+/node_check_compatible
+/node_offset_by_compatible
+/node_offset_by_phandle
+/node_offset_by_prop_value
+/nop_node
+/nop_property
+/nopulate
+/notfound
+/open_pack
+/parent_offset
+/path-references
+/path_offset
+/path_offset_aliases
+/phandle_format
+/references
+/root_node
+/rw_tree1
+/set_name
+/setprop
+/setprop_inplace
+/string_escapes
+/subnode_offset
+/supernode_atdepth_offset
+/sw_tree1
+/truncated_property
+/value-labels