diag: Init dci memory pools during diag bridge init

The patch initialize the dci memory pools only during
diag bridge initialization instead of initializing
during dci ops init.

Change-Id: Ib9d2fc3dcb9bc3fca59a0e408292259b0e4a0d2c
Signed-off-by: Sreelakshmi Gownipalli <sgownipa@codeaurora.org>
Signed-off-by: Manoj Prabhu B <bmanoj@codeaurora.org>