cnss2: Add force wake support

As part of PCIe power management for new WLAN devices, it requires
asserting WAKE register before accessing any MMIO registers outside
first 4K range. Add the support in CNSS driver and expose the APIs
for WLAN host driver.

Change-Id: I69688c229121c12575dde4938961d60bc067751f
Signed-off-by: Yue Ma <yuem@codeaurora.org>