[TF-TSC] Linaro TF TSC representative changes

Hi Abhishek, TSC representatives,

We're doing some changes when it comes to the Linaro TF TSC representatives. - I'm stepping out (but I'm still around in Linaro). - David Brown becomes the main Linaro TF TSC rep. - Ruchika Gupta steps in as the backfill for David when he is unable to attend.

Please update mailing-lists and meeting invitations etc accordingly.

Regards, Joakim