marlin(sepolicy): Redefine cnss_diag folder

The parent folder /data/vendor/wifi of cnss diag is going to
be used by hostapd data file storage. So, rename sepolicy file attribute
to limit the path controlled by the cnss_vendor_data_file attribute.

Bug: Start softap
Test: Compiles
Change-Id: Ib2e04235766d3aba10aa7891e71784da2455d4d8
diff --git a/sepolicy/file_contexts b/sepolicy/file_contexts
index 60fd33b..dea85a7 100644
--- a/sepolicy/file_contexts
+++ b/sepolicy/file_contexts
@@ -181,7 +181,7 @@
 /data/vendor/nfc(/.*)?           u:object_r:nfc_vendor_data_file:s0
 /data/vendor/radio(/.*)?         u:object_r:radio_vendor_data_file:s0
 /data/vendor/sensor(/.*)?        u:object_r:sensor_vendor_data_file:s0
-/data/vendor/wifi(/.*)?          u:object_r:cnss_vendor_data_file:s0
+/data/vendor/wifi/cnss_diag(/.*)? u:object_r:cnss_vendor_data_file:s0
 /data/vendor/ramdump(/.*)?       u:object_r:ramdump_vendor_data_file:s0
 /data/vendor/ssrdump(/.*)?       u:object_r:ramdump_vendor_data_file:s0
 /data/vendor/camera(/.*)?        u:object_r:camera_vendor_data_file:s0