tests: sensor: Fix fdc2x1x in build_all test suite

Add missing new line before channel entry for fdc2x1x
which was causing CI fail

Signed-off-by: Stoyan Bogdanov <sbogdanov@baylibre.com>

Author: bogdanovs

tests/drivers/build_all/sensor/i2c.dtsi

@@ -593,6 +593,7 @@ test_i2c_fdc2x1x: fdc2x1x@54 {
 	sd-gpios = <&test_gpio 0 0>;
 	deglitch = <5>;
 	fref = <43360>;
+
 	channel_0 {
 		rcount = <7499>;
 		settlecount = <48>;