add apple a18 and m4 family types

[nihui]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.00%. Comparing base (c9caafd) to head (14247eb).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6026      +/-   ##
==========================================
+ Coverage   94.69%   95.00%   +0.31%     
==========================================
  Files         769      649     -120     
  Lines      238897   234742    -4155     
==========================================
- Hits       226227   223022    -3205     
+ Misses      12670    11720     -950     

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[github-actions]

The binary size change of libncnn.so (bytes)

architecture	base size	pr size	difference
x86_64	16465128	16465128	0 😘
armhf	7335260	7335260	0 😘
aarch64	10704800	10704800	0 😘