Fixed memory map unit test.
Fixed memory map unit test.

- Added missing blocksize param from FlashRegion ctor.
- Added new test case to verify blocksize and sector_size alias correctly.

mesheven/pyOCD,pyocd/pyOCD,flit/pyOCD,pyocd/pyOCD,mesheven/pyOCD,flit/pyOCD,mbedmicro/pyOCD,mbedmicro/pyOCD,mesheven/pyOCD,mbedmicro/pyOCD