ARM: dts: aspeed: bletchley: Fix ADC vref property names

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>
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>
1 file changed