icnss2: Enable power supply framework for 5.15 kernel

Icnss driver indicates vbatt voltage level to wlan fw
based on battery percentage. This change adds power
supply framework code to enable icnss2 driver to measure
battery percentage and update vbatt volatge level to
wlan fw.

Change-Id: I376805da38222a5e7a20ae4a1737bc978ee6a9ae
Signed-off-by: Sandeep Singh <quic_sandsing@quicinc.com>

icnss2/power.h

@@ -14,5 +14,5 @@ void icnss_put_resources(struct icnss_priv *priv);
 void icnss_put_vreg(struct icnss_priv *priv);
 void icnss_put_clk(struct icnss_priv *priv);
 int icnss_vreg_unvote(struct icnss_priv *priv);
-
+int icnss_get_psf_info(struct icnss_priv *priv);
 #endif