Title: Critical section ukernel test

Description:

This test verifies that the microkernel task_offload_to_fiber() API operates as
expected.

This test has two tasks that increment a counter.  The routine that
increments the counter is invoked from K_swapper() due to the two tasks
calling task_offload_to_fiber().  The final result of the counter is expected
to be the the number of times task_offload_to_fiber() was called to increment
the counter as the incrementing was done in the context of K_swapper().

This is done with time slicing both disabled and enabled to ensure that the
result always matches the number of times task_offload_to_fiber() is called.

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Building and Running Project:

This microkernel project outputs to the console.  It can be built and executed
on QEMU as follows:

    make pristine
    make microkernel.qemu

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Sample Output:

tc_start() - Test Microkernel Critical Section API

Obtained expected <criticalVar> value of 10209055
Enabling time slicing ...
Obtained expected <criticalVar> value of 15123296
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PASS - RegressionTask.
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VXMICRO PROJECT EXECUTION SUCCESSFUL