Split CONFIG_CC_OPTIMIZE_FOR_SIZE into two configs

This adds a separate CONFIG_CC_OPTIMIZE_FOR_SPEED option in a choice,
in preparation for adding another optimization option. Also convert SH's
makefile to use this new option.

Signed-off-by: Sean Anderson <sean.anderson@seco.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/sh/lib/Makefile b/arch/sh/lib/Makefile
index 9618da1..e7520a3 100644
--- a/arch/sh/lib/Makefile
+++ b/arch/sh/lib/Makefile
@@ -12,7 +12,7 @@
 
 udivsi3-y			:= udivsi3_i4i-Os.o
 
-ifneq ($(CONFIG_CC_OPTIMIZE_FOR_SIZE),y)
+ifeq ($(CONFIG_CC_OPTIMIZE_FOR_SPEED),y)
 udivsi3-$(CONFIG_CPU_SH4)	:= udivsi3_i4i.o
 endif
 udivsi3-y			+= udivsi3.o