bluetooth HW is WLS1271 chip connected to UART1.

Device tree modifications:
- Pinmux for UART1.
- Pinmux for bluetooth enable GPIO.

Bluetooth enable GPIO is set to enable during startup by setting the
relevant pinmux pin to pull-up.
Signed-off-by: Uri Mashiach <uri.mashiach@compulab.co.il>
Acked-by: Igor Grinberg <grinberg@compulab.co.il>
Signed-off-by: Tony Lindgren <tony@atomide.com>