zynq: Revert LTHOR setting for zynq for lthor 1.4

Remove LTHOR hacks to support lthor 1.4 version.
Based on our request tizen has fixed lthor 1.5
and enabled support for autodetection. Samsung IDs
were also removed that's why this workaround for zynq
can be reverted.

This patch partially revert this patch:
"zynq: Add USB lthor download protocol support"
(sha1: 63d9c976b291697abe6e3c0ca55d53142c62f23d)

Signed-off-by: Michal Simek <michal.simek@xilinx.com>