Rename vendor-ramdisk to vendor_ramdisk

Rename to get consistent ramdisk directory naming in
out/target/product/<name>:
  debug_ramdisk
  ramdisk
  vendor_debug_ramdisk
  vendor_ramdisk

Test: build and inspect out/target/product/<name>
Change-Id: Ib86e6509bd910e8c95bcb6e3f7bb639ebbfe3758

android/paths.go

@@ -1662,9 +1662,9 @@ func modulePartition(ctx ModuleInstallPathContext, os OsType) string {
 			// on a device without a dedicated recovery partition, install the
 			// recovery variant.
 			if ctx.DeviceConfig().BoardMoveRecoveryResourcesToVendorBoot() {
-				partition = "vendor-ramdisk/first_stage_ramdisk"
+				partition = "vendor_ramdisk/first_stage_ramdisk"
 			} else {
-				partition = "vendor-ramdisk"
+				partition = "vendor_ramdisk"
 			}
 			if !ctx.InstallInRoot() {
 				partition += "/system"

ui/build/cleanbuild.go

@@ -124,7 +124,7 @@ func installClean(ctx Context, config Config) {
 		productOut("obj/PACKAGING"),
 		productOut("ramdisk"),
 		productOut("debug_ramdisk"),
-		productOut("vendor-ramdisk"),
+		productOut("vendor_ramdisk"),
 		productOut("vendor_debug_ramdisk"),
 		productOut("test_harness_ramdisk"),
 		productOut("recovery"),