dt-bindings: arm: qcom: Add Samsung Galaxy Express

Add a compatible for Samsung Galaxy Express SGH-I437.

Signed-off-by: Rudraksha Gupta <guptarud@gmail.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230607050025.86636-2-guptarud@gmail.com