FROMLIST: ath10k: Move regulator config to driver private data

WCN3990 Regulator config is varying b/w different MSM platforms.
In order to have scalable config, move regulator config to driver
private data.

(am from https://patchwork.kernel.org/patch/11028913/

)

BUG=b:137525452
TEST=None

Change-Id: Ia340aacf56c91c023beebd81f3277b8b37b72e23
Signed-off-by: Govind Singh <govinds@codeaurora.org>
Signed-off-by: Vamsi Singamsetty <vamssi@codeaurora.org>