aboot: improve the buffer allocation schemebubblegum96

we try several granularity to make the allocation failure less happen

1) we first will try to allocate buffer as max order of
CONFIG_FILL_BUFF_MAX_SIZE, eg 8192 blocks for SZ_4M if blksz = 512byte
2) if failure occur, we will try to allocate 8192/2=4096 blocks
3) still fail to allocate, we will try size 4096/2=2048 blocks
..
4) untill the allocation success ( the min buffer = 1 block)

Signed-off-by: Yixun Lan <yixun.lan@gmail.com>

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