Add helper functions

Add the helper function to check kernel optional config

Signed-off-by: Vamsee Narapareddi <vnarapar@qti.qualcomm.com>

Author: vnarapar

Runner/utils/functestlib.sh

@@ -222,6 +222,30 @@ check_kernel_config() {
     return 0
 }
 
+# Check each given kernel config is set to y/m in /proc/config.gz, logs result, returns 0/1.
+check_optional_config() {
+    cfgs=$1
+    for config_key in $cfgs; do
+        if command -v zgrep >/dev/null 2>&1; then
+            if zgrep -qE "^${config_key}=(y|m)" /proc/config.gz 2>/dev/null; then
+                log_pass "Kernel config $config_key is enabled"
+            else
+                log_warn "Kernel config $config_key is missing or not enabled"
+                return 1
+            fi
+        else
+            # Fallback if zgrep is unavailable
+            if gzip -dc /proc/config.gz 2>/dev/null | grep -qE "^${config_key}=(y|m)"; then
+                log_pass "Kernel config $config_key is enabled"
+            else
+                log_warn "Kernel config $config_key is missing or not enabled"
+                return 1
+            fi
+        fi
+    done
+    return 0
+}
+
 check_dt_nodes() {
     node_paths="$1"
     log_info "$node_paths"