powerpc, 5xxx, 512x: remove support for mpc5xxx and mpc512x

There was for long time no activity in the mpx5xxx area.
We need to go further and convert to Kconfig, but it
turned out, nobody is interested anymore in mpc5xxx,
so remove it.

Signed-off-by: Heiko Schocher <hs@denx.de>
diff --git a/include/asm-generic/u-boot.h b/include/asm-generic/u-boot.h
index 0c1bdc7..95930ad 100644
--- a/include/asm-generic/u-boot.h
+++ b/include/asm-generic/u-boot.h
@@ -44,7 +44,7 @@
 #if defined(CONFIG_E500) || defined(CONFIG_MPC86xx)
 	unsigned long	bi_immr_base;	/* base of IMMR register */
 #endif
-#if defined(CONFIG_MPC5xxx) || defined(CONFIG_M68K)
+#if defined(CONFIG_M68K)
 	unsigned long	bi_mbar_base;	/* base of internal registers */
 #endif
 #if defined(CONFIG_MPC83xx)
@@ -62,10 +62,7 @@
 	unsigned long	bi_sccfreq;	/* SCC_CLK Freq, in MHz */
 	unsigned long	bi_vco;		/* VCO Out from PLL, in MHz */
 #endif
-#if defined(CONFIG_MPC512X)
-	unsigned long	bi_ipsfreq;	/* IPS Bus Freq, in MHz */
-#endif /* CONFIG_MPC512X */
-#if defined(CONFIG_MPC5xxx) || defined(CONFIG_M68K)
+#if defined(CONFIG_M68K)
 	unsigned long	bi_ipbfreq;	/* IPB Bus Freq, in MHz */
 	unsigned long	bi_pcifreq;	/* PCI Bus Freq, in MHz */
 #endif