Fix ipu6ep firmware loading issue

Issue Detailed: Android14 secpolicy forbids to load the firmware files
from /vendor/firmware/intel/ipu/

Issue Fixed: Modify kernel.te to allow to load firmwares from that path.

Issue Tested: Successfully load ipu6ep.bin which locates in the above
path.

Tracked-On: OAM-129975
Signed-off-by: Zhenlong Z Ji <zhenlong.z.ji@intel.com>
Signed-off-by: Neo Fang <neo.fang@intel.com>

kernel/kernel.te

@@ -12,3 +12,7 @@ allow kernel kernel:capability sys_admin;
 # For loading /lib/modules/inet_diag.ko
 allow kernel rootfs:system module_load;
 allow kernel system_file:system module_load;
+
+# For loading /vendor/firmwares
+allow kernel vendor_file:dir r_dir_perms;
+allow kernel vendor_file:file r_file_perms;