pru-software-support: fix licensing information

Fix the path to the license file, and adjust the licensing information
according to the contents of this file.

Fixes:

  http://autobuild.buildroot.net/results/213cdda78b0a4762ee4fecc0f178df1225062c6f/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/pru-software-support/pru-software-support.mk

@@ -6,8 +6,8 @@
 
 PRU_SOFTWARE_SUPPORT_VERSION = 804b548e69ef9fdf44445f6d0968d81cb8a1e7b4
 PRU_SOFTWARE_SUPPORT_SITE = git://git.ti.com/pru-software-support-package/pru-software-support-package.git
-PRU_SOFTWARE_SUPPORT_LICENSE =  BSD-3c
-PRU_SOFTWARE_SUPPORT_LICENSE_FILES = PRU_Package-v5.0-Manifest.html
+PRU_SOFTWARE_SUPPORT_LICENSE =  BSD-3c, GPLv2, Public Domain
+PRU_SOFTWARE_SUPPORT_LICENSE_FILES = PRU_Package-v4.0-Manifest.html
 PRU_SOFTWARE_SUPPORT_DEPENDENCIES = host-ti-cgt-pru host-pru-software-support
 HOST_PRU_SOFTWARE_SUPPORT_DEPENDENCIES = host-ti-cgt-pru