mkamsboot: fix some Clipv2 that we used to brick

On those models the software bootloader is entered through the SWI vector,
not through the reset vector like we thought.

Use put_uint32le() instead of memcpy
Use mov pc, #0x200 instead of b 0x200, so we can use the same instruction
for both vectors.

Tested on Clipv2 and Clip Zip

Change-Id: I99dc24167dde5558d34fe9795c65b44ff91aa665
1 file changed