regulators: Allow the UART Power regulator field to never be read

It's a common pattern in tacd codebase to collect all Topics
in a struct to make them available to e.g. the UI code.
This field is not used, but should nevertheless be stored
in the respective struct to keep the common pattern.

Signed-off-by: Leonard Göhrs <[email protected]>

Author: hnez

src/regulators.rs

@@ -67,6 +67,7 @@ use reg::regulator_set;
 
 pub struct Regulators {
     pub iobus_pwr_en: Arc<Topic<bool>>,
+    #[allow(dead_code)]
     pub uart_pwr_en: Arc<Topic<bool>>,
 }