boards: starfive: visionfive2: removed trailing whitespace

removed a trailing whitespace in `visionfive2.yaml` which was
causing compliance check failure.

added `Signed-off-by` in previous commits causing pipeline failure

Signed-off-by: Kanak Shilledar <kanakshilledar111@protonmail.com>

boards/starfive/visionfive2/visionfive2.yaml

@@ -2,7 +2,7 @@ identifier: visionfive2
 name: Visionfive JH7110 (NON-SMP)
 type: mcu
 arch: riscv64
-toolchain: 
+toolchain:
   - zephyr
   - cross-compile
 supported: