regulator: da9121: Sync with mainline version

commit  4302b1e69c7e8d751f04a08592c5e2bfa7b12d4f from
https://github.com/Xilinx/linux-xlnx.git

 xlnx_rebase_v5.10

As there is an official up-streamed driver from Dialog, we are
syncing our internal driver with that. Both the versions originated
from Dialog but differ a lot.
So, we cannot have incremental commits, just syncing with mainline
as a single commit.

Signed-off-by: Raviteja Narayanam <raviteja.narayanam@xilinx.com>
State: pending
Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com>