MIPS: Alchemy: Rewrite UART setup and constants.

Detect CPU type at runtime and setup uarts accordingly; also clean up the
uart base address mess in the process as far as possible.

Signed-off-by: Manuel Lauss <manuel.lauss@googlemail.com>
To: Linux-MIPS <linux-mips@linux-mips.org>
Cc: Florian Fainelli <florian@openwrt.org>
Cc: Wolfgang Grandegger <wg@grandegger.com>
Patchwork: https://patchwork.linux-mips.org/patch/2352/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org

arch/mips/boot/compressed/uart-alchemy.c

@@ -3,5 +3,5 @@
 void putc(char c)
 {
 	/* all current (Jan. 2010) in-kernel boards */
-	alchemy_uart_putchar(UART0_PHYS_ADDR, c);
+	alchemy_uart_putchar(AU1000_UART0_PHYS_ADDR, c);
 }