samples: compression: lz4: add TOOLCHAIN_HAS_NEWLIB filter

samples\compression\lz4 rely on CONFIG_NEWLIB_LIBC=y, let's
add TOOLCHAIN_HAS_NEWLIB filter for it.

Signed-off-by: Watson Zeng <zhiwei@synopsys.com>
diff --git a/samples/compression/lz4/sample.yaml b/samples/compression/lz4/sample.yaml
index 561a667..d33b4bb 100644
--- a/samples/compression/lz4/sample.yaml
+++ b/samples/compression/lz4/sample.yaml
@@ -4,6 +4,7 @@
 common:
   tags: compression lz4
   min_ram: 32
+  filter: TOOLCHAIN_HAS_NEWLIB == 1
   harness: console
   harness_config:
     type: one_line