feat(versal_net): add support for QEMU COSIM platform

QEMU COSIM platform is equivalent to qemu with additional cosim
extensions, so just switching platform_id to QEMU if QEMU_COSIM is
detected.

Signed-off-by: Sai Pavan Boddu <sai.pavan.boddu@amd.com>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Change-Id: I922d10b1605c7f900158fa7fbe82571d3b9d4792