DT: leds: Improve description of flash LEDs related properties

1. Since max-microamp property has had no users so far, then rename
   it to more descriptive led-max-microamp.
2. Since flash-timeout-us property has had no users so far, then rename
   it to more accurate flash-max-timeout-us.
3. Describe led-max-microamp property as mandatory for specific board
   configurations.
4. Make flash-max-microamp and flash-max-timeout-us properties mandatory
   for devices with configurable flash current and flash timeout settings
   respectively.

Signed-off-by: Jacek Anaszewski <[email protected]>
Cc: Richard Purdie <[email protected]>
Cc: Pavel Machek <[email protected]>
Cc: [email protected]
Acked-by: Sakari Ailus <[email protected]>
Acked-by: Sylwester Nawrocki <[email protected]>

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