freescale: Drop CONFIG_TARGET_MPC8536DS et al

This option as well as CONFIG_TARGET_P1022DS and CONFIG_TARGET_P5020DS
are not defined anywhere. Drop them.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/board/freescale/common/Makefile b/board/freescale/common/Makefile
index bd035d6..5f0503f 100644
--- a/board/freescale/common/Makefile
+++ b/board/freescale/common/Makefile
@@ -51,8 +51,6 @@
 
 obj-$(CONFIG_TARGET_MPC8548CDS)	+= cds_pci_ft.o
 
-obj-$(CONFIG_TARGET_MPC8536DS)	+= ics307_clk.o
-obj-$(CONFIG_TARGET_P1022DS)		+= ics307_clk.o
 obj-$(CONFIG_TARGET_P3041DS)		+= ics307_clk.o
 obj-$(CONFIG_TARGET_P4080DS)		+= ics307_clk.o
 obj-$(CONFIG_TARGET_P5040DS)		+= ics307_clk.o
@@ -75,7 +73,6 @@
 obj-$(CONFIG_TARGET_P2041RDB)	+= p_corenet/
 obj-$(CONFIG_TARGET_P3041DS)	+= p_corenet/
 obj-$(CONFIG_TARGET_P4080DS)	+= p_corenet/
-obj-$(CONFIG_TARGET_P5020DS)	+= p_corenet/
 obj-$(CONFIG_TARGET_P5040DS)	+= p_corenet/
 
 obj-$(CONFIG_LAYERSCAPE_NS_ACCESS)	+= ns_access.o