ASoC: Update config of SND_HWDEP

As CONFIG_SND_HWDEP is defined by default
in kernel tree, msm-pcm-routing-devdep.c file
in audio drivers gets compiled always.
Use CONFIG_SND_HWDEP_ROUTING config instead of
CONFIG_SND_HWDEP to compile msm-pcm-routing-devdep.c
file.

Change-Id: I19c4b0a56dbe6c4890ece645fcf100687f762f5d
Signed-off-by: Laxminath Kasam <lkasam@codeaurora.org>
Signed-off-by: Meng Wang <mwang@codeaurora.org>