functestlib: add get_remoteproc_path_by_firmware() to fix WiFi_Firmware_Driver

Problem
- WiFi_Firmware_Driver failed with: `get_remoteproc_path_by_firmware: command not found`.
- The runner expects a helper to resolve the remoteproc sysfs path for a given firmware
  (e.g., `wpss.mbn` on Kodiak/qcm6490/WCN6750), but the function was missing.

Signed-off-by: Srikanth Muppandam <[email protected]>

Author: smuppand

Runner/utils/functestlib.sh

@@ -1264,6 +1264,19 @@ dt_has_remoteproc_fw() {
     return 1
 }
 
+# Find the remoteproc path for a given firmware substring (e.g., "adsp", "cdsp", "gdsp").
+get_remoteproc_path_by_firmware() {
+    name="$1"
+    idx path
+    # List all remoteproc firmware nodes, match name, and return the remoteproc path
+    idx=$(cat /sys/class/remoteproc/remoteproc*/firmware 2>/dev/null | grep -n "$name" | cut -d: -f1 | head -n1)
+    [ -z "$idx" ] && return 1
+    idx=$((idx - 1))
+    path="/sys/class/remoteproc/remoteproc${idx}"
+    [ -d "$path" ] && echo "$path" && return 0
+    return 1
+}
+
 # Get remoteproc state
 get_remoteproc_state() {
     rp="$1"