net: cnss2: Add snapshot of CNSS2 driver

This is a snapshot of the CNSS2 driver and associated files as of
msm-4.19 commit a1c93228c0bb
("cnss2: Fix synchronization issues related to idle shutdown").

Remove obsolete cnss_utils.c and add Kconfig dependency.
Replace bus scaling APIs with interconnect APIs due to msm_bus migration.

CRs-Fixed: 2500800
Change-Id: I4f0af08c3d0f2982a0f9605dcc56bfeb0145a3fa
Signed-off-by: Yuanyuan Liu <yuanliu@codeaurora.org>