sunxi: Kconfig consolidation and cleanup

A few simple patches which consolidate some Kconfig options and make SPL_FEL a first class .config member instead of putting it in CONFIG_SYS_EXTRA_OPTIONS.

This means it is possible to do a FEL build for any board with:
make <board>_config
echo CONFIG_SPL_FEL=y >> .config
echo CONFIG_SPL_FEL=y >> spl/.config
or better
make <board>_config
sed -i -e 's/\# CONFIG_SPL_FEL is not set/CONFIG_SPL_FEL=y/g' .config spl/.config
which is still one more step than I would like but still preferable IMHO to:

	sed -i -e 's/^CONFIG_SYS_EXTRA_OPTIONS="[^"]*/&,SPL_FEL/g' .config spl/.config

I've been using a little hack (below) to MAKEALL to help build test this.

There's still plenty of stuff in sunxi CONFIG_SYS_EXTRA_OPTIONS which could be moved out, but most of it is dependent on drivers/*/Kconfig switching first.

Probably the board and power controller selection could be moved out without any dependencies, although the board one in particular will be quite a big patch I think it would be worth it.

Ian.

My MAKEALL hack, surely not upstreamable ;-)

index 7c16319..3a8d1d0 100755
@@ -660,6 +660,11 @@ build_target() {
 	echo "Building ${target} board..."
 	${MAKE} -s ${target}_defconfig >/dev/null
 
+	if [ -n "$SUNXI_FORCE_FEL" ] ; then
+	    sed -i -e 's/\# CONFIG_SPL_FEL is not set/CONFIG_SPL_FEL=y/g' \
+		.config spl/.config
+	fi
+
 	${MAKE} ${JOBS} ${CHECK} all \
 		>${LOG_DIR}/$target.MAKELOG 2> ${LOG_DIR}/$target.ERR