ppc: Remove PCIPPC2 and PCIPPC6 boards

These boards seem to be unmaintained for quite some time. So lets
remove support for them completely. This also cleans up some
common drivers/files.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Guillaume Alexandre <guillaume.alexandre@gespac.ch>
Acked-by: Wolfgang Denk <wd@denx.de>
diff --git a/arch/powerpc/cpu/74xx_7xx/cpu.c b/arch/powerpc/cpu/74xx_7xx/cpu.c
index b6a31b4..17694a1 100644
--- a/arch/powerpc/cpu/74xx_7xx/cpu.c
+++ b/arch/powerpc/cpu/74xx_7xx/cpu.c
@@ -229,8 +229,7 @@
 }
 
 
-#if !defined(CONFIG_PCIPPC2) && \
-    !defined(CONFIG_BAB7xx)  && \
+#if !defined(CONFIG_BAB7xx)  && \
     !defined(CONFIG_ELPPC)   && \
     !defined(CONFIG_PPMC7XX)
 /* no generic way to do board reset. simply call soft_reset. */
@@ -288,13 +287,13 @@
 /* ------------------------------------------------------------------------- */
 
 #if defined(CONFIG_WATCHDOG)
-#if !defined(CONFIG_PCIPPC2) && !defined(CONFIG_BAB7xx)
+#if !defined(CONFIG_BAB7xx)
 void
 watchdog_reset(void)
 {
 
 }
-#endif  /* !CONFIG_PCIPPC2 && !CONFIG_BAB7xx */
+#endif  /* !CONFIG_BAB7xx */
 #endif	/* CONFIG_WATCHDOG */
 
 /* ------------------------------------------------------------------------- */