Blackfin: convert BFIN_CPU to CONFIG_BFIN_CPU

Stop tying things to the processor that should be tied to other defines and
change BFIN_CPU to CONFIG_BFIN_CPU so that it can be used in the build
system to select the -mcpu option.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/blackfin_config.mk b/blackfin_config.mk
index a7513ea..d90eb23 100644
--- a/blackfin_config.mk
+++ b/blackfin_config.mk
@@ -24,9 +24,13 @@
 PLATFORM_RELFLAGS += -ffixed-P5
 PLATFORM_CPPFLAGS += -DCONFIG_BLACKFIN
 
+ifneq (,$(CONFIG_BFIN_CPU))
+PLATFORM_RELFLAGS += -mcpu=$(CONFIG_BFIN_CPU)
+endif
+
 SYM_PREFIX = _
 
 LDR_FLAGS += --use-vmas
-ifeq (,$(findstring s,$(MAKEFLAGS)))
+ifneq (,$(findstring s,$(MAKEFLAGS)))
 LDR_FLAGS += --quiet
 endif