use less agressive max background process limit

Change-Id: I699a7f43f64ea3d14128a4b7644522495be8acff
reorganize and cleanup makefiles

*move ramdisk
*simplify copying prebuilt
*reorganize makefiles
*remove unneeded makefiles

Change-Id: I4af7d017796f3f49c58e3e117ce804b9afc6791a
update patches