tty: serial: qcom_geni_serial: Add support for flow control

Add support for flow control functionality in the GENI serial driver
and also support for non-console higher baud rate(upto 4Mbps) usecases.
Signed-off-by: Girish Mahadevan <girishm@codeaurora.org>
Signed-off-by: Mohammed Khajapasha <mkhaja@codeaurora.org>
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/soc/qcom/qcom,geni-se.txt

@@ -46,7 +46,7 @@ Child nodes should conform to I2C bus binding as described in i2c.txt.
 Qualcomm Technologies Inc. GENI Serial Engine based UART Controller
 
 Required properties:
-- compatible:		Must be "qcom,geni-debug-uart".
+- compatible:		Must be "qcom,geni-debug-uart" or "qcom,geni-uart".
 - reg: 			Must contain UART register location and length.
 - interrupts: 		Must contain UART core interrupts.
 - clock-names:		Must contain "se".