bluetooth: update the default BLE connection parameters

Modify the connection interval default min/max values at
6-40 (7.5-50ms).

Change-Id: I8804effe60679bff59bd56cf532986d133686295
Signed-off-by: Rock Shen <rock_shen@asus.com>

Author: RockShen-ASUS

net/bluetooth/hci_core.c

@@ -3271,8 +3271,8 @@ struct hci_dev *hci_alloc_dev(void)
 	hdev->le_adv_max_interval = 0x0800;
 	hdev->le_scan_interval = 0x0060;
 	hdev->le_scan_window = 0x0030;
-	hdev->le_conn_min_interval = 0x0028;
-	hdev->le_conn_max_interval = 0x0038;
+	hdev->le_conn_min_interval = 0x0006;
+	hdev->le_conn_max_interval = 0x0028;
 	hdev->le_conn_latency = 0x0000;
 	hdev->le_supv_timeout = 0x002a;
 	hdev->le_def_tx_len = 0x001b;