lz4 is moved as optional module, add step in README to add
as project filter to include into west manifest.
Fixes: https://github.com/zephyrproject-rtos/zephyr/issues/65127
Signed-off-by: Parthiban Nallathambi <parthiban@linumiz.com>
all the external modules related samples are part of samples/modules,
whereas lz4 is in parent. move it to sample/modules/compression/lz4
Signed-off-by: Parthiban Nallathambi <parthiban@linumiz.com>