board: samsung: fix menu entries for a{3,7}y17lte

a7y17lte is called SM-A720F, and a3y17lte SM-A320F.  a3y17lte also
should select PINCTRL_EXYNOS78x0, not the (non-existent)
PINCTRL_EXYNOS7880, and it has an Exynos 7870 SoC and not 7880.

Fixes: 3e2095e960b4 ("board: samsung: add support for Galaxy A series
of 2017 (a5y17lte)")
Signed-off-by: Henrik Grimler <henrik@grimler.se>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/arch/arm/mach-exynos/Kconfig b/arch/arm/mach-exynos/Kconfig
index 10301c1..6087d93 100644
--- a/arch/arm/mach-exynos/Kconfig
+++ b/arch/arm/mach-exynos/Kconfig
@@ -162,7 +162,7 @@
 	select SUPPORT_SPL
 
 config  TARGET_A7Y17LTE
-	bool "Samsung SM-A520F board"
+	bool "Samsung SM-A720F board"
 	select ARM64
 	select CLK_EXYNOS
 	select OF_CONTROL
@@ -171,12 +171,12 @@
 	select SUPPORT_SPL
 
 config  TARGET_A3Y17LTE
-	bool "Samsung SM-A520F board"
+	bool "Samsung SM-A320F board"
 	select ARM64
 	select CLK_EXYNOS
 	select OF_CONTROL
 	select PINCTRL
-	select PINCTRL_EXYNOS7880
+	select PINCTRL_EXYNOS78x0
 	select SUPPORT_SPL
 
 endchoice