powerpc, 5xx: remove support for 5xx

There was for long time no activity in the 5xx area.
We need to go further and convert to Kconfig, but it
turned out, nobody is interested anymore in 5xx,
so remove it.

Signed-off-by: Heiko Schocher <hs@denx.de>
diff --git a/api/api_platform-powerpc.c b/api/api_platform-powerpc.c
index 307a5f5..7d54ea7 100644
--- a/api/api_platform-powerpc.c
+++ b/api/api_platform-powerpc.c
@@ -30,8 +30,7 @@
 	si->clk_bus = gd->bus_clk;
 	si->clk_cpu = gd->cpu_clk;
 
-#if defined(CONFIG_5xx) || \
-    defined(CONFIG_E500) || defined(CONFIG_MPC86xx)
+#if defined(CONFIG_E500) || defined(CONFIG_MPC86xx)
 #define bi_bar	bi_immr_base
 #elif defined(CONFIG_MPC5xxx)
 #define bi_bar	bi_mbar_base