Example to demonstrate usage of `mbed_stats_cpu_get()` API usage

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0:3114f82feb68
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Tue Jun 05 17:34:16 2018 +0100
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+https://github.com/ARMmbed/mbed-os/#5371c107353f20ab79edcbe8a005cb7c0ea9249e