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PD#TV-6340 Problem: When quickly enter live tv just after boot to home, video may display more than 10 seconds late after sound comeout. The main problem is cma allocation time too long. Solution: 1, add a page flag for pages under cma allocating. And do not increase page-ref count for cma pages under allocating when it is used by user space again. 2, restrict shmem/swap back pages using cma 3, improve cma using policy check in page allocating process. 4, replace righ page trace for migrated pages. Change-Id: Ie6b591213a9eda974c3443ca9b491fa8d00cee50 Signed-off-by: Tao Zeng <tao.zeng@amlogic.com>