Rewrite 1x1 convolutions to gemm #21358

Job	Run time
cancel	3s
Check if image exists in registry	5s
licensing	4m 5s
linux (ubuntu-20.04, debug)	1h 21m 11s
linux (ubuntu-20.04, release)	1h 21m 9s
linux-fpga (ubuntu-20.04, debug)	1h 56m 11s
linux (ubuntu-20.04, codecov)	1h 18m 39s
pyflakes	3m 17s
Build image	1h 8m 26s
Build SLES image	1h 7m 53s
sles	34m 47s
format	4m 48s
cppcheck	56m 24s
tidy	1h 29m 44s
	11h 26m 42s

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