Return the currect memory type when wrapping system memory.

[maleadt]

This depends on the system: If HMM is supported, use unified memory, otherwise register the buffer as host memory.

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 72.78%. Comparing base (c423ce3) to head (92b40df).

Files	Patch %	Lines
src/array.jl	80.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #2363       +/-   ##
===========================================
+ Coverage   59.88%   72.78%   +12.89%     
===========================================
  Files         157      157               
  Lines       15109    15148       +39     
===========================================
+ Hits         9048    11025     +1977     
+ Misses       6061     4123     -1938     

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