Rewrite 1x1 convolutions to gemm #21735

Job	Run time
pyflakes	8m 37s
Check if image exists in registry	5s
cancel	2s
licensing	3m 9s
linux (ubuntu-20.04, debug)	45m 19s
linux-fpga (ubuntu-20.04, debug)	44m 50s
linux (ubuntu-20.04, release)	8m 10s
misspell	23s
linux (ubuntu-20.04, codecov)	11m 28s
Build SLES image	0s
Build image	0s
sles	5m 2s
cppcheck	1h 0m 9s
format	6m 9s
tidy	7m 34s
	3h 20m 57s

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