[qca-nss-drv] Seperate nss_phys_if with nss-gmac

The nss_phys_if interface was tightly bind with nss-gmac in the original
implementation. Clean up nss_phys_if and move nss-gmac specific code into
data_plane layer

Change-Id: Ide89fea2bacae9fe5b7580f4ea66d6bab695a46a
Signed-off-by: Stephen Wang <wstephen@codeaurora.org>
6 files changed