Merge tag 'backport/v4.14.61/snapshot-to-v4.18+fixes-flattened' of https://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas-backport into v4.14.69-ltsi-rc1-wip

LTSI-v4.14 Backport or I2C R-Car Fix

Base:
* v4.14.61
* Backports of components for Renesas SoCs to v4.18

Backport of post-v4.18 fix for i2c-rcar:
* implement STOP and REP_START according to docs

Dependency of above
* Refactor private flags of i2c-rcar driver