arm: remove lubbock board support

Enough time has passed since this board was moved to Orphan. Remove.

 - Remove board/lubbock/*
 - Remove include/configs/lubbock.h
 - Cleanup defined(CONFIG_LUBBOCK)
 - Move the entry from boards.cfg to doc/README.scrapyard

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/doc/README.scrapyard b/doc/README.scrapyard
index 0e4d329..15c39e7 100644
--- a/doc/README.scrapyard
+++ b/doc/README.scrapyard
@@ -11,6 +11,7 @@
 
 Board            Arch        CPU            Commit      Removed     Last known maintainer/contact
 =================================================================================================
+lubbock          arm         pxa            -           2014-04-04  Kyle Harris <kharris@nexus-tech.net>
 MOUSSE           powerpc     mpc824x        -           2014-04-04
 rsdproto         powerpc     mpc8260        -           2014-04-04
 RPXsuper         powerpc     mpc8260        -           2014-04-04