Revert "Cleanup and generalize functions of Hermitian matrices (#1340)"

[jishnub]

This reverts commit 611395d.

Unfortunately, this PR introduced some method ambiguities that weren't caught by the CI, as the ambiguity test was broken. After the fix in #1349, this now causes test failures on master (https://buildkite.com/julialang/linearalgebra-dot-jl/builds/740#0196c86e-2d8c-42c2-b9ae-a2143427f43e).

Please re-land the PR after fixing the ambiguities.

CC: @araujoms

[codecov]

Codecov Report

Attention: Patch coverage is 97.29730% with 2 lines in your changes missing coverage. Please review.

Project coverage is 93.75%. Comparing base (0b46d5c) to head (1143a11).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/symmetric.jl	97.29%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1357   +/-   ##
=======================================
  Coverage   93.74%   93.75%           
=======================================
  Files          34       34           
  Lines       15721    15755   +34     
=======================================
+ Hits        14738    14771   +33     
- Misses        983      984    +1     

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