fix BBB servo cape overlay#174

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lorforlinux wants to merge 4 commits intobeagleboard:masterfrom

lorforlinux:servo

Commits on Jun 13, 2020

fix BBB servo cape overlay
lorforlinux
committed

Commits on Jun 21, 2020

fix naming
lorforlinux
committed

Commits on Jun 23, 2020

fix naming and pwm-cells value
lorforlinux
committed

Commits on Jul 13, 2020

Make servoCape compatible with BBB and BBAI
lorforlinux
committed