distro/rhel9: fix ami being hybrid for 9.2 and older

    RHEL 9.2 and older doesn't support UEFI in AWS. The code correctly set
    it for EC2 images, but not for ami. This commit fixes that.

pkg/distro/rhel/rhel9/distro.go

@@ -202,6 +202,12 @@ func newDistro(name string, major, minor int) *rhel.Distribution {
 			ImageFormat: platform.FORMAT_RAW,
 		},
 	}
+
+	// keep the RHEL EC2 x86_64 images before 9.3 BIOS-only for backward compatibility
+	if rd.IsRHEL() && common.VersionLessThan(rd.OsVersion(), "9.3") {
+		ec2X86Platform.UEFIVendor = ""
+	}
+
 	x86_64.AddImageTypes(
 		ec2X86Platform,
 		mkAMIImgTypeX86_64(),
@@ -337,16 +343,6 @@ func newDistro(name string, major, minor int) *rhel.Distribution {
 
 		x86_64.AddImageTypes(azureX64Platform, mkAzureSapInternalImgType(rd))
 
-		// keep the RHEL EC2 x86_64 images before 9.3 BIOS-only for backward compatibility
-		if common.VersionLessThan(rd.OsVersion(), "9.3") {
-			ec2X86Platform = &platform.X86{
-				BIOS: true,
-				BasePlatform: platform.BasePlatform{
-					ImageFormat: platform.FORMAT_RAW,
-				},
-			}
-		}
-
 		// add ec2 image types to RHEL distro only
 		x86_64.AddImageTypes(ec2X86Platform, mkEc2ImgTypeX86_64(), mkEc2HaImgTypeX86_64(), mkEC2SapImgTypeX86_64(rd.OsVersion()))