tinyalsa: add license files

Signed-off-by: Rahul Bedarkar <rahul.bedarkar@imgtec.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/tinyalsa/tinyalsa.mk

@@ -7,6 +7,7 @@
 TINYALSA_VERSION = 1.1.0
 TINYALSA_SITE = $(call github,tinyalsa,tinyalsa,$(TINYALSA_VERSION))
 TINYALSA_LICENSE = BSD-3c
+TINYALSA_LICENSE_FILES = NOTICE
 TINYALSA_INSTALL_STAGING = YES
 
 define TINYALSA_BUILD_CMDS