Implement BF16 using generic_float class #21443

Job	Run time
Check if image exists in registry	4s
pyflakes	3m 0s
cancel	2s
licensing	5m 49s
linux (ubuntu-20.04, debug)	19m 0s
linux-fpga (ubuntu-20.04, debug)	26m 34s
linux (ubuntu-20.04, release)	18m 58s
linux (ubuntu-20.04, codecov)	18m 43s
Build SLES image	0s
Build image	0s
cppcheck	26m 24s
tidy	4m 44s
format	4m 49s
sles	8m 23s
	2h 16m 30s

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