package/paho-mqtt-c: fix bump to version 1.3.2

package/paho-mqtt-c: fix bump to version 1.3.2

Commit e69b8ddd43292b03b8f30f748ee2279b8df64c47 bumped paho-mqtt-c to
version 1.3.2 but hash was wrong moreover licence has changed to EPL-2.0
since
https://github.com/eclipse/paho.mqtt.c/commit/1e91229cb6403e3a9b02dfdc11c71b04c0518cff

So fix that and add LICENSE to the list of license files

Fixes:
 - http://autobuild.buildroot.org/results/7ea1791778053613e9ef6b146dbd1992a0f63dc6

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>