dt-bindings: samsung: Document bindings for Midas family boards

Document GT-I9300, GT-I9305, GT-N7100, and GT-N7105 bindings, along
with the shared "midas" binding.
Signed-off-by: NSimon Shields <simon@lineageos.org>
Reviewed-by: NRob Herring <robh@kernel.org>
Signed-off-by: NKrzysztof Kozlowski <krzk@kernel.org>

Documentation/devicetree/bindings/arm/samsung/samsung-boards.txt

@@ -9,7 +9,11 @@ Required root node properties:
 	- "samsung,smdkv310"	- for Exynos4210-based Samsung SMDKV310 eval board.
 	- "samsung,trats"	- for Exynos4210-based Tizen Reference board.
 	- "samsung,universal_c210" - for Exynos4210-based Samsung board.
+	- "samsung,i9300"          - for Exynos4412-based Samsung GT-I9300 board.
+	- "samsung,i9305"          - for Exynos4412-based Samsung GT-I9305 board.
+	- "samsung,midas"       - for Exynos4412-based Samsung Midas board.
 	- "samsung,smdk4412",	- for Exynos4412-based Samsung SMDK4412 eval board.
+	- "samsung,n710x"          - for Exynos4412-based Samsung GT-N7100/GT-N7105 board.
 	- "samsung,trats2"	- for Exynos4412-based Tizen Reference board.
 	- "samsung,smdk5250"	- for Exynos5250-based Samsung SMDK5250 eval board.
 	- "samsung,xyref5260"	- for Exynos5260-based Samsung board.