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: I81d8f2cafe5e1b9024196cd74772b78d4a4aec58
diff --git a/core/Makefile b/core/Makefile
index cb5e44c..ed9465d 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -1257,7 +1257,7 @@
 license_modules_rehomed += $(filter $(PRODUCT_OUT)/data/%,$(license_modules_rest))
 license_modules_rehomed += $(filter $(PRODUCT_OUT)/ramdisk/%,$(license_modules_rest))
 license_modules_rehomed += $(filter $(PRODUCT_OUT)/debug_ramdisk/%,$(license_modules_rest))
-license_modules_rehomed += $(filter $(PRODUCT_OUT)/vendor-ramdisk/%,$(license_modules_rest))
+license_modules_rehomed += $(filter $(PRODUCT_OUT)/vendor_ramdisk/%,$(license_modules_rest))
 license_modules_rehomed += $(filter $(PRODUCT_OUT)/persist/%,$(license_modules_rest))
 license_modules_rehomed += $(filter $(PRODUCT_OUT)/persist.img,$(license_modules_rest))
 license_modules_rehomed += $(filter $(PRODUCT_OUT)/system_other/%,$(license_modules_rest))