Move buildroot to bsp directory.

bsp/buildroot/package/mysql/mysqld.service

@@ -0,0 +1,10 @@
+[Unit]
+Description=MySQL database server
+
+[Service]
+ExecStartPre=/bin/sh -c 'test -d /var/mysql/mysql || mysql_install_db --user=mysql --ldata=/var/mysql'
+ExecStart=/usr/bin/mysqld_safe
+Restart=always
+
+[Install]
+WantedBy=multi-user.target