msm: 8960: Add serial console support on the 8960 SGLTE target

The SGLTE variant of the 8960 CDP target has the UART
console on GSBI8 rather than GSBI5, so make the serial
device and gpiomux registration conditional on the target
subtype.

Change-Id: I95394f6b88dad1af0a529394a80d59010d07b29a
Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
diff --git a/arch/arm/mach-msm/devices.h b/arch/arm/mach-msm/devices.h
index 5758dc4..078e931 100644
--- a/arch/arm/mach-msm/devices.h
+++ b/arch/arm/mach-msm/devices.h
@@ -55,6 +55,7 @@
 
 extern struct platform_device msm8960_device_uart_gsbi2;
 extern struct platform_device msm8960_device_uart_gsbi5;
+extern struct platform_device msm8960_device_uart_gsbi8;
 extern struct platform_device msm8960_device_ssbi_pmic;
 extern struct platform_device msm8960_device_qup_i2c_gsbi3;
 extern struct platform_device msm8960_device_qup_i2c_gsbi4;