nios2-generic: Fix logic around choosing UART

* Before, the normal altera UART driver was compiled in unconditionally and the JTAG UART was missed out.

* Work around this by conditionalizing the driver to use based on the UART choice in the user's custom FPGA header file. If both were to be present, the JTAG UART would have preference.

---
 include/configs/nios2-generic.h |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

b/include/configs/nios2-generic.h
index 9ba35e8..6f4d166 100644

@@ -36,10 +36,11 @@
 /*
  * SERIAL
  */
-#define CONFIG_ALTERA_UART
-#if defined(CONFIG_ALTERA_JTAG_UART)
+#if defined(CONFIG_SYS_JTAG_UART_BASE)
+# define CONFIG_ALTERA_JTAG_UART
 # define CONFIG_SYS_NIOS_CONSOLE	CONFIG_SYS_JTAG_UART_BASE
 #else
+# define CONFIG_ALTERA_UART
 # define CONFIG_SYS_NIOS_CONSOLE	CONFIG_SYS_UART_BASE
 #endif
 

1.7.3.4