mips: au1x00: Remove support for these SoCs

The only platform left for the AU1x00 SoCs was the pb1x00 platform, an
apparent clone of the dbau1x00 platform.  As pb1x00 had no listed
maintainer I am assuming that it is also orphaned.  Remove this platform
and then remove the unused SoC support.

Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
diff --git a/arch/mips/include/asm/addrspace.h b/arch/mips/include/asm/addrspace.h
index 7deb516..b6d3876 100644
--- a/arch/mips/include/asm/addrspace.h
+++ b/arch/mips/include/asm/addrspace.h
@@ -130,13 +130,13 @@
  * Returns the uncached address of a sdram address
  */
 #ifndef __ASSEMBLY__
-#if defined(CONFIG_SOC_AU1X00) || defined(CONFIG_TB0229)
+#if defined(CONFIG_TB0229)
 /* We use a 36 bit physical address map here and
    cannot access physical memory directly from core */
 #define UNCACHED_SDRAM(a) (((unsigned long)(a)) | 0x20000000)
-#else	/* !CONFIG_SOC_AU1X00 */
+#else	/* !CONFIG_TB0229 */
 #define UNCACHED_SDRAM(a) CKSEG1ADDR(a)
-#endif	/* CONFIG_SOC_AU1X00 */
+#endif	/* CONFIG_TB0229 */
 #endif	/* __ASSEMBLY__ */
 
 /*