net: stmmac: Configure vlan registers and channels

These are custom changes to configure QMI Over ethernet and bring
up VLAN interface and queue traffic to a particular channel.

Change-Id: I83bfb74875d05eefd7ce9ab595d5e75f7d07e97d
Acked-by: Abhishek Chauhan <abchauha@qti.qualcomm.com>
Signed-off-by: Sunil Paidimarri <hisunil@codeaurora.org>