ath10k: Add support for chain1 regulator supply voting

Add support to vote for chain-1 voltage regulator
in WCN3990.

Tested-on: WCN3990 hw1.0 SNOC WLAN.HL.3.1-01040-QCAHLSWMTPLZ-1

Signed-off-by: Rakesh Pillai <pillair@codeaurora.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/1593194502-13164-3-git-send-email-pillair@codeaurora.org