aws/type/api: add support of field publicIpv4Pool

Add the support of publicIpv4Pool (platform.aws) on install-config
to set the Public IPv4 Pool ID that the user brought to the AWS
Account.

Author: mtulio

data/data/install.openshift.io_installconfigs.yaml

@@ -2287,6 +2287,11 @@ spec:
                       operators to include the specified user tags in the tags of
                       the AWS resources that the operators create.
                     type: boolean
+                  publicIpv4Pool:
+                    description: PublicIpv4Pool is an optional field that can be used
+                      to tell the installation process to use Public IPv4 address
+                      that you bring to your AWS account with BYOIP.
+                    type: string
                   region:
                     description: Region specifies the AWS region where the cluster
                       will be created.

pkg/explain/printer_test.go

@@ -179,6 +179,9 @@ func Test_PrintFields(t *testing.T) {
     propagateUserTags <boolean>
       PropagateUserTags is a flag that directs in-cluster operators to include the specified user tags in the tags of the AWS resources that the operators create.
 
+    publicIpv4Pool <string>
+      PublicIpv4Pool is an optional field that can be used to tell the installation process to use Public IPv4 address that you bring to your AWS account with BYOIP.
+
     region <string> -required-
       Region specifies the AWS region where the cluster will be created.
 

pkg/types/aws/platform.go

@@ -106,6 +106,11 @@ type Platform struct {
 	// during bootstrap destroy.
 	// +optional
 	PreserveBootstrapIgnition bool `json:"preserveBootstrapIgnition,omitempty"`
+
+	// PublicIpv4Pool is an optional field that can be used to tell the installation process to use
+	// Public IPv4 address that you bring to your AWS account with BYOIP.
+	// +optional
+	PublicIpv4Pool string `json:"publicIpv4Pool,omitempty"`
 }
 
 // ServiceEndpoint store the configuration for services to