ARM: multi_v7_defconfig: defconfig: Enable r8a7792 SoC

Enable support for r8a7792 SoC in multi_v7_defconfig.
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/configs/multi_v7_defconfig

@@ -90,6 +90,7 @@ CONFIG_ARCH_R8A7778=y
 CONFIG_ARCH_R8A7779=y
 CONFIG_ARCH_R8A7790=y
 CONFIG_ARCH_R8A7791=y
+CONFIG_ARCH_R8A7792=y
 CONFIG_ARCH_R8A7793=y
 CONFIG_ARCH_R8A7794=y
 CONFIG_ARCH_SH73A0=y