msm_serial_hs: Enable GSBI6 as UARTDM device

This change configures GSBI6 into UARTDM mode.
It adds configuration require for clocks, ADM Channels and CRCI.

CRs-Fixed: 299610
Signed-off-by: Mayank Rana <mrana@codeaurora.org>
diff --git a/arch/arm/mach-msm/devices.h b/arch/arm/mach-msm/devices.h
index e9599af..5bb8b8e 100644
--- a/arch/arm/mach-msm/devices.h
+++ b/arch/arm/mach-msm/devices.h
@@ -42,6 +42,7 @@
 extern struct platform_device msm_device_uart_dm3;
 extern struct platform_device msm_device_uart_dm12;
 extern struct platform_device *msm_device_uart_gsbi9;
+extern struct platform_device msm_device_uart_dm6;
 
 extern struct platform_device msm8960_device_uart_gsbi2;
 extern struct platform_device msm8960_device_uart_gsbi5;