Convert CONFIG_SYS_FSL_DDR_MAIN_NUM_CTRLS et al to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_FSL_DDR_MAIN_NUM_CTRLS
   CONFIG_SYS_FSL_OTHER_DDR_NUM_CTRLS

And we remove the entries from the README for a number of already
converted items.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/cpu/armv8/fsl-layerscape/Kconfig b/arch/arm/cpu/armv8/fsl-layerscape/Kconfig
index 1f86070..91a5863 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/Kconfig
+++ b/arch/arm/cpu/armv8/fsl-layerscape/Kconfig
@@ -193,6 +193,7 @@
 	select FSL_IFC
 	select FSL_LAYERSCAPE
 	select FSL_LSCH3
+	select SYS_FSL_OTHER_DDR_NUM_CTRLS
 	select GICV3
 	select SKIP_LOWLEVEL_INIT
 	select SYS_FSL_SRDS_1