cnss2: Avoid checking PCIe status in IRQ or IRQ disable context

PCIe config space read during checking PCIe status may take a few
milliseconds, so avoid checking PCIe status in IRQ or IRQ disable
context for such cases before accessing any registers.

Change-Id: Ib63ae8f47e27bd607300bd304adbb000ba59f27e
Signed-off-by: Yue Ma <yuem@codeaurora.org>