msm: ep_pcie: Add KPI marker and log for PCIe link init

Add logs and Boot KPI Markers in PCIe EP driver for link
Initialization. This is required for KPI consistency
and KPI calculation and getting KPI data.

Change-Id: I1b2696ba3fdd9e6dda2cb23bfbab941b8fcc8f32
Signed-off-by: Nitesh Gupta <nitegupt@codeaurora.org>