powerpc: remove genietv board support

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

 - Remove board/genietv/*
 - Remove include/configs/GENIETV.h
 - Clean-up if defined(CONFIG_GENIETV)
 - 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 4e0ad32..b068544 100644
--- a/doc/README.scrapyard
+++ b/doc/README.scrapyard
@@ -11,6 +11,7 @@
 
 Board            Arch        CPU            Commit      Removed     Last known maintainer/contact
 =================================================================================================
+genietv          powerpc     mpc8xx         -           2014-04-04
 mbx8xx           powerpc     mpc8xx         -           2014-04-04
 nx823            powerpc     mpc8xx         -           2014-04-04
 idmr             m68k        mcf52x2        ba650e9b    2014-01-28