cnss2: Add support for additional regulator

Add support for regulator: 3.3V M.2, to enable
it based on the entry in device tree.

Change-Id: I4716b9ad6fb6d116342ef0aa9157989f9dfbf152
CRs-Fixed: 3795246

cnss2/power.c

@@ -22,6 +22,7 @@
 
 #if IS_ENABLED(CONFIG_ARCH_QCOM)
 static struct cnss_vreg_cfg cnss_vreg_list[] = {
+	{"vdd-wlan-m2", 3300000, 3300000, 0, 0, 0},
 	{"vdd-wlan-core", 1300000, 1300000, 0, 0, 0},
 	{"vdd-wlan-io", 1800000, 1800000, 0, 0, 0},
 	{"vdd-wlan-io12", 1200000, 1200000, 0, 0, 0},