gpio: pca953x: support pcal6408 and pcal6416

Add support to NXP GPIO expanders pcal6408, documented at [1], and
pcal6416, documented at [2].

[1] https://www.nxp.com/docs/en/data-sheet/PCAL6408A.pdf
[2] https://www.nxp.com/docs/en/data-sheet/PCAL6416A.pdf

Signed-off-by: Emanuele Ghidoli <emanuele.ghidoli@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
1 file changed