Removed battery voltage divider and U_BATT_MON signal to SoM

Battery voltage can and will be measured by the BQ25792RQ IC via I2C
register.

linht-hw.kicad_sch

@@ -713,16 +713,6 @@
 		)
 		(uuid "b2fc58d0-fa76-475a-a952-aa419d8ba842")
 	)
-	(wire
-		(pts
-			(xy 163.83 80.01) (xy 212.09 80.01)
-		)
-		(stroke
-			(width 0)
-			(type default)
-		)
-		(uuid "b66e3d7b-5528-4c7d-9c98-05ee7c18070d")
-	)
 	(wire
 		(pts
 			(xy 163.83 97.79) (xy 176.53 97.79)
@@ -2267,16 +2257,6 @@
 				(justify left top)
 			)
 		)
-		(pin "U_BATT_MON" output
-			(at 212.09 80.01 180)
-			(uuid "29a882d5-a40e-476d-8dde-7afc50b15d76")
-			(effects
-				(font
-					(size 1.27 1.27)
-				)
-				(justify left)
-			)
-		)
 		(pin "SCL" input
 			(at 237.49 80.01 0)
 			(uuid "d410a988-7e51-456b-ab1b-c4a69b91ac98")