Replace non-functional 'vref' with 'aspeed,int-vref-microvolt'
using the default 2.5V that the driver was already applying.

Signed-off-by: Cosmo Chou <chou.cosmo@gmail.com>
---
 arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-bletchley.dts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-bletchley.dts b/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-bletchley.dts
index 123e2d1891f6..7c27bf6bb51d 100644
--- a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-bletchley.dts
+++ b/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-bletchley.dts
@@ -1032,7 +1032,7 @@ &gpio0 {
 };
 
 &adc0 {
-	vref = <1800>;
+	aspeed,int-vref-microvolt = <2500000>;
 	status = "okay";
 
 	pinctrl-names = "default";
@@ -1043,7 +1043,7 @@ &pinctrl_adc4_default &pinctrl_adc5_default
 };
 
 &adc1 {
-	vref = <2500>;
+	aspeed,int-vref-microvolt = <2500000>;
 	status = "okay";
 
 	pinctrl-names = "default";
-- 
2.43.0