arm64: dts: renesas: Align GPIO hog names with dtschema

Dtschema expects GPIO hogs to end with a "hog" suffix.
Also, the convention for node names is to use hyphens, not underscores.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/baee4b9980576ffbab24122fce7147c9cbc2ea59.1645705998.git.geert+renesas@glider.be