serial: sh: Unify R8A7795 and R8A7796 as Gen3

Unify the CONFIG_R8A7795 and CONFIG_R8A7796 as CONFIG_RCAR_GEN3
so that every time we add a new SoC, we won't have to add more
stuff to this list.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

drivers/serial/serial_sh.h

@@ -226,8 +226,7 @@ struct uart_port {
 # define SCSCR_INIT(port)	0x38	/* TIE=0,RIE=0,TE=1,RE=1,REIE=1 */
 #elif defined(CONFIG_R8A7790) || defined(CONFIG_R8A7791) || \
 	defined(CONFIG_R8A7792) || defined(CONFIG_R8A7793) || \
-	defined(CONFIG_R8A7794) || defined(CONFIG_R8A7795) || \
-	defined(CONFIG_R8A7796)
+	defined(CONFIG_R8A7794) || defined(CONFIG_RCAR_GEN3)
 # if defined(CONFIG_SCIF_A)
 #  define SCIF_ORER	0x0200
 # else