Add Renesas R8A77970 PFC driver

Hello!

Here's a set of 2 patches against the 'sh-pfcl' branch of Geert Uyyterhoeven's 'renesas-drivers.git' repo. The patches add support for the R8A77970 PFC (note that the pin pull-up/down support was removed in the last minute since that part of the PFC driver has been reworked by Geert -- I will convert my code to the new pull-up/down API later...

[1/2] pinctrl: sh-pfc: add PORT_GP_CFG_{6|22}() helper macros [2/2] pinctrl: sh-pfc: add R8A77970 PFC support

MBR, Sergei
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