scripts/spelling.txt: add "neded" pattern and fix typo instances

Fix typos and add the following to the scripts/spelling.txt:

  neded||needed

While we are here, fix the "overriden", "wont", and "etc" in the same
hunk in drivers/media/usb/tm6000/tm6000-input.c.

Link: http://lkml.kernel.org/r/1481573103-11329-14-git-send-email-yamada.masahiro@socionext.com
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/scripts/spelling.txt b/scripts/spelling.txt
index af842a7..5a26fa1 100644
--- a/scripts/spelling.txt
+++ b/scripts/spelling.txt
@@ -675,6 +675,7 @@
 neccesary||necessary
 neccessary||necessary
 necesary||necessary
+neded||needed
 negaive||negative
 negoitation||negotiation
 negotation||negotiation