boards: ignore sih for Snappy

When sih (simulation in hardware) was compiled for Snapdragon, we got
the linking problem below. I'm not sure why, supposedly the symbol
`double sin(double)` is missing.

undefined PLT symbol _LSin (705) /libpx4.so (symbol.c:303)

boards/atlflight/eagle/default.cmake

@@ -84,7 +84,7 @@ px4_add_board(
 		mc_pos_control
 		navigator
 		sensors
-		sih
+		#sih
 		simulator
 		vmount
 		vtol_att_control

boards/atlflight/eagle/qurt-default.cmake

@@ -74,7 +74,7 @@ px4_add_board(
 		mc_att_control
 		mc_pos_control
 		sensors
-		sih
+		#sih
 		vmount
 		vtol_att_control
 		wind_estimator