dts: remove cris & metag dts hard link file

arch cris & metag have been removed from supported archs. The dts hard link files should also be removed, or the ctags tool will give warning.

execute"ctags -R", output:
ctags: Warning: cannot open source file "scripts/dtc/include-prefixes/cris" : No such file or directory
ctags: Warning: cannot open source file "scripts/dtc/include-prefixes/metag" : No such file or directory

deleted file mode 120000
index 736d998..0000000
@@ -1 +0,0 @@
-../../../arch/cris/boot/dts
\ No newline at end of file

deleted file mode 120000
index 87a3c84..0000000
@@ -1 +0,0 @@
-../../../arch/metag/boot/dts
\ No newline at end of file

2.7.4

Applied to my asm-generic tree, thanks!

Arnd