ARM: dts: aspeed: ahe50dc: Update lm25066 regulator name

ARM: dts: aspeed: ahe50dc: Update lm25066 regulator name

A recent change to the lm25066 driver changed the name of its
regulator from vout0 to vout; device-tree users of lm25066's regulator
functionality (of which ahe50dc is the only one) thus require a
corresponding update.

Signed-off-by: Zev Weiss <zev@bewilderbeest.net>
Cc: Conor Dooley <conor+dt@kernel.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>