samples: net: Port mbedtls benchmark sample to zephyr

This application benchmarks the various cryptographic primitives
offered by mbed TLS.

Signed-off-by: Ravi kumar Veeramally <ravikumar.veeramally@linux.intel.com>

samples/crypto/mbedtls_benchmark/CMakeLists.txt

@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.8.2)
+include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE)
+project(mbedtls_benchmark)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})

samples/crypto/mbedtls_benchmark/prj.conf

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+# Kernel options
+CONFIG_MAIN_STACK_SIZE=10000
+CONFIG_ENTROPY_GENERATOR=y
+CONFIG_INIT_STACKS=y
+
+# Logging
+CONFIG_PRINTK=y
+CONFIG_MBEDTLS_DEBUG=y
+CONFIG_MBEDTLS_DEBUG_LEVEL=4
+
+# TLS configuration
+CONFIG_MBEDTLS=y
+CONFIG_MBEDTLS_BUILTIN=y
+CONFIG_MBEDTLS_ENABLE_HEAP=y
+CONFIG_MBEDTLS_HEAP_SIZE=64000
+CONFIG_MBEDTLS_SSL_MAX_CONTENT_LEN=2048
+
+CONFIG_MBEDTLS_TLS_VERSION_1_2=y
+CONFIG_MBEDTLS_KEY_EXCHANGE_ALL_ENABLED=y
+CONFIG_MBEDTLS_CIPHER_ALL_ENABLED=y
+CONFIG_MBEDTLS_ECP_ALL_ENABLED=y
+CONFIG_MBEDTLS_MAC_ALL_ENABLED=y
+CONFIG_MBEDTLS_GENPRIME_ENABLED=y
+CONFIG_MBEDTLS_HMAC_DRBG_ENABLED=y

samples/crypto/mbedtls_benchmark/sample.yaml

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+common:
+  harness: crypto
+  tags: crypto
+sample:
+  description: mbed TLS benchmark application
+  name: mbedTLS Benchmark
+tests:
+  test:
+    platform_whitelist: qemu_x86 frdm_k64f sam_e70_xplained