Ramdisk modules install to correct location

Install to recovery/root/first_stage_ramdisk if BOARD_USES_RECOVERY_AS_BOOT,
otherwise ramdisk. In addition, append /system if not InstallInRoot().

Test: pass
Bug: 147347110
Change-Id: Ie5895ac61a3d5d85f5d958a27c7980d6c79d997e
diff --git a/android/config.go b/android/config.go
index 1cb543d..f0f84e7 100644
--- a/android/config.go
+++ b/android/config.go
@@ -1233,3 +1233,7 @@
 func (c *deviceConfig) DeviceSecondaryArchVariant() string {
 	return String(c.config.productVariables.DeviceSecondaryArchVariant)
 }
+
+func (c *deviceConfig) BoardUsesRecoveryAsBoot() bool {
+	return Bool(c.config.productVariables.BoardUsesRecoveryAsBoot)
+}