diag: Proper feature mask update to Glink supported peripherals

The patch re-enables updating APPS feature mask to GLINK
supported peripheral after peripheral's feature mask has been
processed and the proper transport has been updated. The patch
also corrects code indentation in buffers initialization.

CRs-Fixed: 2092758
Change-Id: Iaff5346dae833d6dbb576ca3a4a9dbdcf789a3c4
Signed-off-by: Manoj Prabhu B <bmanoj@codeaurora.org>