soc: renesas: Remove ARCH_R8A7796

All users of CONFIG_ARCH_R8A7796 have been updated to use
CONFIG_ARCH_R8A77960, so the former can be removed.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20191211100510.7182-1-geert+renesas@glider.be

drivers/soc/renesas/Kconfig

@@ -200,13 +200,9 @@ config ARCH_R8A7795
 	  This enables support for the Renesas R-Car H3 SoC.
 
 config ARCH_R8A77960
-	bool
+	bool "Renesas R-Car M3-W SoC Platform"
 	select ARCH_RCAR_GEN3
 	select SYSC_R8A77960
-
-config ARCH_R8A7796
-	bool "Renesas R-Car M3-W SoC Platform"
-	select ARCH_R8A77960
 	help
 	  This enables support for the Renesas R-Car M3-W SoC.