ENGR00294746 ARM:imx6:sabresd/sabreauto/slevk Support android FDT embedded image

Since the "mkbootimg" tool can't use the "unused" fields of
bootimg header, Android will set the FDT info at the "second_addr"
and "second_size" fields.

To support this change, booti command was changed to use new fields.
The memory management(lmb) is added in booti, and the relocation of
DTB and ramdisk is disabled at default, to prevent relocating to
a high address which overlaps kernel's vmalloc area.

The kernel image which needs FDT accompanied is larger than old. So in
making boot.img, suggest to set "--base" parameter enough offset from
kernel entry "0x10008000" to keep ramdisk and DTB not be overwritten by
zImage decompression. For example "--base 0x14000000"

Signed-off-by: Ye.Li <B37916@freescale.com>

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