arm64: defconfig: Visconti: Enable GPIO

Enable Visconti's GPIO in the ARM64 defconfig.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>

arch/arm64/configs/defconfig

diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index 882507f..b152806 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -530,6 +530,7 @@
 CONFIG_GPIO_PL061=y
 CONFIG_GPIO_RCAR=y
 CONFIG_GPIO_UNIPHIER=y
+CONFIG_GPIO_VISCONTI=y
 CONFIG_GPIO_WCD934X=m
 CONFIG_GPIO_XGENE=y
 CONFIG_GPIO_XGENE_SB=y