tests: Add simple MLO test case to exercise single drv

tests: Add simple MLO test case to exercise single drv

Add MLO test case to test one one-link MLD and one two-link MLD
coexisting case in such a way that single drv path can be exercised.
Connect ML STA to each and verify traffic.

Configs will be used as shown below:

   +--------------------+     +------------------+
   |     config 2       |     |      config 1    |
   |                    |     |                  |
   |                    |     |                  |
   | +----------------+ |     |                  |
   | |     BSS 1      | |     |                  |
   | | ssid: mld-0    | |     |                  |
   | +----------------+ |     |                  |
   |                    |     |                  |
 +-----------------------------------------------------------------+
 | | +----------------+ |     | +--------------+ |                 |
 | | |     BSS 2      | |     | |     BSS 1    | |                 |
 | | | ssid: mld-1    | |     | | ssid: mld-1  | |  2 Link MLO AP  |
 | | +----------------+ |     | +--------------+ |                 |
 | +--------------------+     +------------------+                 |
 +-----------------------------------------------------------------+

Signed-off-by: Aditya Kumar Singh <quic_adisi@quicinc.com>