ColdFire: PLATFORM_CPPFLAGS updates for new compiler

Update PLATFORM_CPPFLAGS to accept 4.3.x version of
ColdFire compiler.

Signed-off-by: TsiChung Liew <Tsi-Chung.Liew@freescale.com>
diff --git a/cpu/mcf523x/config.mk b/cpu/mcf523x/config.mk
index 93645a3..fc79454 100644
--- a/cpu/mcf523x/config.mk
+++ b/cpu/mcf523x/config.mk
@@ -24,7 +24,7 @@
 #
 
 PLATFORM_RELFLAGS += -ffixed-d7 -msep-data
-ifeq ($(findstring 4.2,$(shell $(CC) --version)),4.2)
+ifneq ($(findstring 4.1,$(shell $(CC) --version)),4.1)
 PLATFORM_CPPFLAGS += -mcpu=5235 -fPIC
 else
 PLATFORM_CPPFLAGS += -m5307 -fPIC