imx-gst1.0-plugin: configure for available platforms only
For the MACHINEOVERRIDES "mx6dl" and "mx6q" PLATFORM is set to MX6DL and MX6Q,
respectively, resulting in the following error from the configure script:
| configure: error: No target platform specified!
| Use ./configure PLATFORM=(MX6/MX6QP/MX6SL/MX6SX/MX6UL/MX7D) to retry
Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com> Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>