[arista] Add support for more 7280CR3 variants (sonic-net#3711)

* Add extra Smartsville hwskus

Author: Staphylo

device/arista/x86_64-arista_7280cr3k_32p4

@@ -0,0 +1 @@
+x86_64-arista_7280cr3_32p4

files/Aboot/boot0.j2

@@ -258,10 +258,18 @@ platform_specific() {
         aboot_machine=arista_7060dx4_32
         flash_size=28000
     fi
-    if [ "$sid" = "Smartsville" ]; then
+    if [ "$sid" = "Smartsville" ] || [ "$sid" = "SmartsvilleSsd" ]; then
         aboot_machine=arista_7280cr3_32p4
         flash_size=7382
     fi
+    if [ "$sid" = "SmartsvilleBK" ] || [ "$sid" = "SmartsvilleBKSsd" ]; then
+        aboot_machine=arista_7280cr3k_32p4
+        flash_size=7382
+    fi
+    if [ "$sid" = "SmartsvilleDD" ] || [ "$sid" = "SmartsvilleDDSsd" ]; then
+        aboot_machine=arista_7280cr3_32d4
+        flash_size=7382
+    fi
     if [ "$platform" = "rook" ] || [ "$platform" = "magpie" ] ||
        [ "$platform" = "woodpecker" ]; then
         echo "tsc=reliable pcie_ports=native" >>/tmp/append