ppc: Remove MPC8555CDS boards

These boards have not been converted to CONFIG_DM_PCI by the deadline and is
also missing conversion to CONFIG_DM.  Remove them.  As this is the only
ARCH_MPC8555 platform left, remove that support as well.

Cc: Priyanka Jain <priyanka.jain@nxp.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/powerpc/cpu/mpc85xx/cpu.c b/arch/powerpc/cpu/mpc85xx/cpu.c
index e8126c9..610a8ec 100644
--- a/arch/powerpc/cpu/mpc85xx/cpu.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu.c
@@ -301,8 +301,7 @@
 int do_reset(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
 /* Everything after the first generation of PQ3 parts has RSTCR */
-#if defined(CONFIG_ARCH_MPC8540) || defined(CONFIG_ARCH_MPC8555) || \
-	defined(CONFIG_ARCH_MPC8560)
+#if defined(CONFIG_ARCH_MPC8540) || defined(CONFIG_ARCH_MPC8560)
 	unsigned long val, msr;
 
 	/*