Convert CONFIG_SYS_FSL_CORES_PER_CLUSTER to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_FSL_CORES_PER_CLUSTER

As part of this, correct the dependencies on SYS_FSL_THREADS_PER_CORE.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/powerpc/cpu/mpc85xx/Kconfig b/arch/powerpc/cpu/mpc85xx/Kconfig
index 2ac6b87..18ef718 100644
--- a/arch/powerpc/cpu/mpc85xx/Kconfig
+++ b/arch/powerpc/cpu/mpc85xx/Kconfig
@@ -1173,8 +1173,16 @@
 		Number of local access windows. This is fixed per SoC.
 		If not sure, do not change.
 
+config SYS_FSL_CORES_PER_CLUSTER
+	int
+	depends on SYS_FSL_QORIQ_CHASSIS2
+	default 4 if ARCH_B4860 || ARCH_T2080 || ARCH_T4240
+	default 2 if ARCH_B4420
+	default 1 if ARCH_T1024 || ARCH_T1040 || ARCH_T1042
+
 config SYS_FSL_THREADS_PER_CORE
 	int
+	depends on SYS_FSL_QORIQ_CHASSIS2
 	default 2 if E6500
 	default 1