cnss2: Add new flag to check drv support

There is illegal logic when call cnss_pci_suspend and check DRV
support. This change adds new flag - drv_supported to replace
cnss_pci_get_drv_connected and fixes this issue.

Change-Id: Ia836e06283ebe08483e325717fb30bac333ef5b7
Signed-off-by: Wu Gao <wugao@codeaurora.org>