RFR: JMC-6596 Remove extra text in platform-definition-photon

[Jie Kang]

Hi!

Please review this tiny fix to the target file.

Webrev: http://cr.openjdk.java.net/~jkang/JMC-6596/webrev.01/
Bug: https://bugs.openjdk.java.net/browse/JMC-6596


Regards,
Jie Kang