1，修改蓝牙的波特率

这个改3000000能提高一点速度,蓝牙本来速度都很慢,最多也就200k左右速度

diff --git a/hardware/broadcom/libbt/include/vnd_rksdk.txt b/hardware/broadcom/libbt/include/vnd_rksdk.txt
index d2d93fe48b0…af6c1662b77 100755
— a/hardware/broadcom/libbt/include/vnd_rksdk.txt
+++ b/hardware/broadcom/libbt/include/vnd_rksdk.txt
@@ -1,7 +1,7 @@
BLUETOOTH_UART_DEVICE_PORT = “/dev/ttyS9”
FW_PATCHFILE_LOCATION = “/vendor/etc/firmware/”
VENDOR_LIB_CONF_FILE = “/vendor/etc/bluetooth/bt_vendor.conf”
-UART_TARGET_BAUD_RATE = 1500000
+UART_TARGET_BAUD_RATE = 3000000
FW_PATCH_SETTLEMENT_DELAY_MS = 200
USERIAL_VENDOR_SET_BAUD_DELAY_US = 200000
LPM_IDLE_TIMEOUT_MULTIPLE = 5