scripts: dtc: make dtb out with alignment 4 bytes

dtb size should be aligned with 4 bytes when we use appended dtb
in the zImage-dtb. Bootloader parses the dtb header from the appended dtb.
If not aligned 4 bytes, it would cause data abort due to unaligned data
access.

Change-Id: I8f80341864ceeb2dddbd23712d8193605c6fb8c3
Signed-off-by: Devin Kim <dojip.kim@lge.com>
lz4: Fixing mention of lz4demo
Fix compile errors
KozmiKKernel: Updating att defconfig
KozmiKKernel: Updating Build dir