realtek: deduplicate GS1900 recipes

ZyXEL GS1900 devices with SoCs from both the RTL838x and RTL839x
families share the same image structure and size of the firmware
partition. Additionally, the GS1900-48 recipe provided a parameter for
the zyxel-vers command, but this parameter is not used. Deduplicate the
recipes by moving it to target/linux/realtek/image/common.mk.

Signed-off-by: Sander Vanheule <sander@svanheule.net>

target/linux/realtek/image/common.mk

@@ -52,3 +52,15 @@ define Device/hpe_1920
 	check-size | \
 	append-metadata
 endef
+
+define Device/zyxel_gs1900
+  DEVICE_VENDOR := ZyXEL
+  IMAGE_SIZE := 6976k
+  UIMAGE_MAGIC := 0x83800000
+  KERNEL_INITRAMFS := \
+	kernel-bin | \
+	append-dtb | \
+	gzip | \
+	zyxel-vers | \
+	uImage gzip
+endef

target/linux/realtek/image/rtl838x.mk

@@ -218,21 +218,9 @@ define Device/tplink_sg2210p-v3
 endef
 TARGET_DEVICES += tplink_sg2210p-v3
 
-define Device/zyxel_gs1900
-  SOC := rtl8380
-  IMAGE_SIZE := 6976k
-  DEVICE_VENDOR := ZyXEL
-  UIMAGE_MAGIC := 0x83800000
-  KERNEL_INITRAMFS := \
-	kernel-bin | \
-	append-dtb | \
-	gzip | \
-	zyxel-vers | \
-	uImage gzip
-endef
-
 define Device/zyxel_gs1900-10hp
   $(Device/zyxel_gs1900)
+  SOC := rtl8380
   DEVICE_MODEL := GS1900-10HP
   ZYXEL_VERS := AAZI
 endef
@@ -248,6 +236,7 @@ TARGET_DEVICES += zyxel_gs1900-16
 
 define Device/zyxel_gs1900-8
   $(Device/zyxel_gs1900)
+  SOC := rtl8380
   DEVICE_MODEL := GS1900-8
   ZYXEL_VERS := AAHH
 endef
@@ -255,6 +244,7 @@ TARGET_DEVICES += zyxel_gs1900-8
 
 define Device/zyxel_gs1900-8hp-v1
   $(Device/zyxel_gs1900)
+  SOC := rtl8380
   DEVICE_MODEL := GS1900-8HP
   DEVICE_VARIANT := v1
   ZYXEL_VERS := AAHI
@@ -264,6 +254,7 @@ TARGET_DEVICES += zyxel_gs1900-8hp-v1
 
 define Device/zyxel_gs1900-8hp-v2
   $(Device/zyxel_gs1900)
+  SOC := rtl8380
   DEVICE_MODEL := GS1900-8HP
   DEVICE_VARIANT := v2
   ZYXEL_VERS := AAHI

target/linux/realtek/image/rtl839x.mk

@@ -37,17 +37,9 @@ endef
 TARGET_DEVICES += tplink_sg2452p-v4
 
 define Device/zyxel_gs1900-48
+  $(Device/zyxel_gs1900)
   SOC := rtl8393
-  IMAGE_SIZE := 6976k
-  DEVICE_VENDOR := ZyXEL
-  UIMAGE_MAGIC := 0x83800000
-  ZYXEL_VERS := AAHN
   DEVICE_MODEL := GS1900-48
-  KERNEL_INITRAMFS := \
-	kernel-bin | \
-	append-dtb | \
-	gzip | \
-	zyxel-vers $$$$(ZYXEL_VERS) | \
-	uImage gzip
+  ZYXEL_VERS := AAHN
 endef
 TARGET_DEVICES += zyxel_gs1900-48