[gcp] Fixup for the deprecated Secure Boot guest OS feature (#9371)

GCP informed us that the GuestOsFeature SECURE_BOOT is deprecated and
that they are using UEFI_COMPATIBLE instead. This means, using an image
with 'UEFI_COMPATIBLE' guest OS feature confirms the 'secureBoot'
feature compatibility.

builder/googlecompute/image.go

@@ -27,7 +27,7 @@ func (i *Image) IsWindows() bool {
 
 func (i *Image) IsSecureBootCompatible() bool {
 	for _, osFeature := range i.GuestOsFeatures {
-		if osFeature.Type == "SECURE_BOOT" {
+		if osFeature.Type == "UEFI_COMPATIBLE" {
 			return true
 		}
 	}