The "renesas,rcar-sata" compatible value was deprecated by
"renesas,sata-r8a7779" many years ago, in commit e67adb4e
("sata_rcar: Add R-Car Gen2 SATA PHY support").  Drop it.
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: NNiklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://lore.kernel.org/r/20200219153929.11073-1-geert+renesas@glider.be