cnss: Add PCIE_SWITCH_DELAY when wlan do SSR

Some platforms use a PCIE swith to attach our wifi with other PCIE
card on the same RC like P5459, it will need extra time to stable
signals, otherwise fail to create the pcie link when do SSR, add
PCIE_SWITCH_DELAY to fix the issue.

CRs-Fixed: 1063265
Change-Id: I2b8ea3d8dddbfe4c97f010c608ef5727fdd69bc2
Signed-off-by: Frank Liu <qiliu@codeaurora.org>