of: unittest: Add a test case for of_find_node_opts_by_path() with alias+path+options

To test of_find_node_opts_by_path() take @path argument with pattern:

"alias-name/node-name-1/.../node-name-N:options", for example:
"testcase-alias/phandle-tests/consumer-a:testaliasoption"

Signed-off-by: Zijun Hu <quic_zijuhu@quicinc.com>
Link: https://lore.kernel.org/r/20241216-of_core_fix-v2-2-e69b8f60da63@quicinc.com


Signed-off-by: Rob Herring (Arm) <robh@kernel.org>