Merge pull request #7157 from philljj/fix_zephyr_benchmark_rsa

zephyr samples: fix wolfssl_benchmark RSA.

Author: JacobBarthelmeh

zephyr/samples/wolfssl_benchmark/prj.conf

@@ -1,5 +1,6 @@
 # Configure stack and heap sizes
 CONFIG_MAIN_STACK_SIZE=32768
+CONFIG_COMMON_LIBC_MALLOC_ARENA_SIZE=8192
 
 # Pthreads
 CONFIG_PTHREAD_IPC=y