fs/tar: add option for zstd compression

Signed-off-by: Vladimir Svoboda <vsvoboda@forkoder.eu>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

fs/tar/Config.in

@@ -46,6 +46,11 @@ config BR2_TARGET_ROOTFS_TAR_XZ
 	help
 	  Do compress the tarball with xz.
 
+config BR2_TARGET_ROOTFS_TAR_ZSTD
+	bool "zstd"
+	help
+	  Do compress the tarball with zstd.
+
 endchoice
 
 config BR2_TARGET_ROOTFS_TAR_OPTIONS