samples: compression: lz4 requires more than 64kB of RAM

Set the min_ram limit to 64kB so that with new ztest lib
can run the sample on board with enough ram.
Smaller ram platforms are not used anymore.

Signed-off-by: Francois Ramu <francois.ramu@st.com>
diff --git a/samples/compression/lz4/sample.yaml b/samples/compression/lz4/sample.yaml
index 74cb54b..ae28e9c 100644
--- a/samples/compression/lz4/sample.yaml
+++ b/samples/compression/lz4/sample.yaml
@@ -3,7 +3,7 @@
   description: lz4 data compression library
 common:
   tags: compression lz4
-  min_ram: 40
+  min_ram: 64
   filter: TOOLCHAIN_HAS_NEWLIB == 1
   harness: console
   harness_config: