With board revision 1.3, SolidRun moved the power LED to the middle of the board. In old place of power LED a GPIO controllable heartbeat LED was added. This commit only touches Single Shot variant, since only this variant is all revision 1.3. Reported-by: Alexandra Alth <alexandra@alth.de> Signed-off-by: Tomasz Maciej Nowak <tmn505@gmail.com> Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>