Enable LPM mode by changing BT_VND_OP_LPM_SET_MODE handler

In BT_VND_OP_LPM_SET_MODE handler, if LPM mode is configured, we will
return success enable LPM mode, so that BT stack can hold wake lock
through LPM mode. We added a new persistent property to configure it

Change-Id: I4350a8d88d845cf9c7a1d80ea659763cc5309399
diff --git a/libbt-vendor/src/bt_vendor_qcom.c b/libbt-vendor/src/bt_vendor_qcom.c
index 6586f36..47b735f 100644
--- a/libbt-vendor/src/bt_vendor_qcom.c
+++ b/libbt-vendor/src/bt_vendor_qcom.c
@@ -725,6 +725,7 @@
     char wipower_status[PROPERTY_VALUE_MAX];
     char emb_wp_mode[PROPERTY_VALUE_MAX];
     char bt_version[PROPERTY_VALUE_MAX];
+    char lpm_config[PROPERTY_VALUE_MAX];
     bool ignore_boot_prop = TRUE;
 #ifdef READ_BT_ADDR_FROM_PROP
     int i = 0;
@@ -1151,8 +1152,21 @@
                 }
                 q->cb->lpm_cb(BT_VND_OP_RESULT_SUCCESS);
             } else {
-                /* respond with failure as it's  handled by other mechanism */
-                q->cb->lpm_cb(BT_VND_OP_RESULT_FAIL);
+                int lpm_result = BT_VND_OP_RESULT_SUCCESS;
+
+                property_get("persist.service.bdroid.lpmcfg", lpm_config, "all");
+                ALOGI("%s: property_get: persist.service.bdroid.lpmcfg: %s",
+                            __func__, lpm_config);
+
+                if (!strcmp(lpm_config, "all")) {
+                    // respond with success since we want to hold wake lock through LPM
+                    lpm_result = BT_VND_OP_RESULT_SUCCESS;
+                }
+                else {
+                    lpm_result = BT_VND_OP_RESULT_FAIL;
+                }
+
+                q->cb->lpm_cb(lpm_result);
             }
             break;