wil6210: Init Rx vring right after reset

at the vring initialisation, memory pool get allocated in the FW.
Make it 1-st because FW need this memory pool to precess
next commands

Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>