kexec: bump to version 2.0.8

Also add hash file.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/kexec/kexec.hash

@@ -0,0 +1,2 @@
+# From https://www.kernel.org/pub/linux/utils/kernel/kexec/sha256sums.asc
+sha256	f3abe96fa0793e63936725a4471429f070039a1e81e605deb378747194a50c47	kexec-tools-2.0.8.tar.xz

package/kexec/kexec.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-KEXEC_VERSION = 2.0.7
+KEXEC_VERSION = 2.0.8
 KEXEC_SOURCE = kexec-tools-$(KEXEC_VERSION).tar.xz
 KEXEC_SITE = $(BR2_KERNEL_MIRROR)/linux/utils/kernel/kexec
 KEXEC_LICENSE = GPLv2