xz: bump version to 5.2.0

-Bump version to 5.2.0
-Update hash file
-Use xz tarball instead of bz2 to save space and bandwidth

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/xz/xz.hash

@@ -1,2 +1,2 @@
 # Locally calculated after checking pgp signature
-sha256	166c48d2842519bc4f96333bff9e265f8cdda44d38e40594ef3f9bbb52890490	xz-5.0.5.tar.bz2
+sha256  5962fe32e0b42c7065b4410b7d8ffbf2895e197e97d410c4fc374ea0d7610a14  xz-5.2.0.tar.xz

package/xz/xz.mk

@@ -4,8 +4,8 @@
 #
 ################################################################################
 
-XZ_VERSION = 5.0.5
-XZ_SOURCE = xz-$(XZ_VERSION).tar.bz2
+XZ_VERSION = 5.2.0
+XZ_SOURCE = xz-$(XZ_VERSION).tar.xz
 XZ_SITE = http://tukaani.org/xz
 XZ_INSTALL_STAGING = YES
 XZ_CONF_ENV = ac_cv_prog_cc_c99='-std=gnu99'