tpm2_hash: Change default hashing alg from sha1 to sha256

[idesai]

Fixes #3340

[codecov]

Codecov Report

Attention: 40 lines in your changes are missing coverage. Please review.

Comparison is base (98ca6ba) 74.38% compared to head (58d0129) 74.30%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
tools/tpm2_changeauth.c	35.71%	9 Missing ⚠️
tools/tpm2_import.c	35.71%	9 Missing ⚠️
tools/misc/tpm2_encodeobject.c	44.44%	5 Missing ⚠️
lib/tpm2.c	60.00%	4 Missing ⚠️
tools/tpm2_createak.c	25.00%	3 Missing ⚠️
tools/tpm2_createek.c	40.00%	3 Missing ⚠️
tools/tpm2_loadexternal.c	40.00%	3 Missing ⚠️
lib/tpm2_util.c	60.00%	2 Missing ⚠️
tools/tpm2_create.c	90.90%	1 Missing ⚠️
tools/tpm2_load.c	93.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3342      +/-   ##
==========================================
- Coverage   74.38%   74.30%   -0.09%     
==========================================
  Files         173      173              
  Lines       23673    23754      +81     
==========================================
+ Hits        17610    17651      +41     
- Misses       6063     6103      +40     

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