Add debug ramdisk variant.

A module will be installed to /debug_ramdisk if debug_ramdisk is set to
true.

This is a reland of f84e9c05e2103149162e4a78a68f20c164fbbba2, with a fix
that removes /first_stage_ramdisk.

Bug: 184004542
Test: soong test
Change-Id: I739de63cfec6b0fec5a90f7c4741fc4d884d209c
diff --git a/cc/image.go b/cc/image.go
index 66b02d9..b853798 100644
--- a/cc/image.go
+++ b/cc/image.go
@@ -601,6 +601,10 @@
 	return c.Properties.VendorRamdiskVariantNeeded
 }
 
+func (c *Module) DebugRamdiskVariantNeeded(ctx android.BaseModuleContext) bool {
+	return false
+}
+
 func (c *Module) RecoveryVariantNeeded(ctx android.BaseModuleContext) bool {
 	return c.Properties.RecoveryVariantNeeded
 }