arm64: Kconfig.platforms: Group NXP platforms together

Group the three NXP platforms under an ARCH_NXP menuconfig symbol to
make make selection of similar vendor SoCs visually nicer.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20220829173830.3567047-3-f.fainelli@gmail.com'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm64/Kconfig.platforms

@@ -143,12 +143,6 @@ config ARCH_K3
 	  This enables support for Texas Instruments' K3 multicore SoC
 	  architecture.
 
-config ARCH_LAYERSCAPE
-	bool "ARMv8 based Freescale Layerscape SoC family"
-	select EDAC_SUPPORT
-	help
-	  This enables support for the Freescale Layerscape SoC family.
-
 config ARCH_LG1K
 	bool "LG Electronics LG1K SoC Family"
 	help
@@ -207,6 +201,17 @@ config ARCH_MVEBU
 	   - Armada 8K SoC Family
 	   - 98DX2530 SoC Family
 
+menuconfig ARCH_NXP
+	bool "NXP SoC support"
+
+if ARCH_NXP
+
+config ARCH_LAYERSCAPE
+	bool "ARMv8 based Freescale Layerscape SoC family"
+	select EDAC_SUPPORT
+	help
+	  This enables support for the Freescale Layerscape SoC family.
+
 config ARCH_MXC
 	bool "ARMv8 based NXP i.MX SoC family"
 	select ARM64_ERRATUM_843419
@@ -221,6 +226,13 @@ config ARCH_MXC
 	  This enables support for the ARMv8 based SoCs in the
 	  NXP i.MX family.
 
+config ARCH_S32
+	bool "NXP S32 SoC Family"
+	help
+	  This enables support for the NXP S32 family of processors.
+
+endif
+
 config ARCH_NPCM
 	bool "Nuvoton NPCM Architecture"
 	select PINCTRL
@@ -264,11 +276,6 @@ config ARCH_ROCKCHIP
 	  This enables support for the ARMv8 based Rockchip chipsets,
 	  like the RK3368.
 
-config ARCH_S32
-	bool "NXP S32 SoC Family"
-	help
-	  This enables support for the NXP S32 family of processors.
-
 config ARCH_SEATTLE
 	bool "AMD Seattle SoC Family"
 	help