hal: Add provision to select hpx backend based on the codec type

- SLIMBUS_0 is the backend on 8952 external codec PLs.
  Whereas PRIMARY_MI2S is the backend on 8952 internal codec PLs.

- Since both these PLs are supported on same code base,
  provision is required to select backend based on codec type.

Change-Id: I716dc16abe920dad4b3d18281624a7d85967ea0b
diff --git a/hal/msm8960/platform.c b/hal/msm8960/platform.c
index bbfa042..925095e 100644
--- a/hal/msm8960/platform.c
+++ b/hal/msm8960/platform.c
@@ -230,6 +230,8 @@
     char value[PROPERTY_VALUE_MAX];
     struct platform_data *my_data;
     const char *snd_card_name;
+    const char *mixer_ctl_name = "Set HPX ActiveBe";
+    struct mixer_ctl *ctl = NULL;
 
     adev->mixer = mixer_open(MIXER_CARD);
 
@@ -340,6 +342,13 @@
         }
     }
 
+    /* Configure active back end for HPX*/
+    ctl = mixer_get_ctl_by_name(adev->mixer, mixer_ctl_name);
+    if (ctl) {
+        ALOGI(" sending HPX Active BE information ");
+        mixer_ctl_set_value(ctl, 0, false);
+    }
+
     return my_data;
 }