MIPS: Alchemy: remove SOC_AU1X00 in favor of MIPS_ALCHEMY

Remove the CONFIG_SOC_AU1X00 Kconfig symbol since its job can also be done
by MACH_ALCHEMY, now renamed to MIPS_ALCHEMY.

Signed-off-by: Manuel Lauss <manuel.lauss@googlemail.com>
To: Linux-MIPS <linux-mips@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/1461/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig
index 6a58cb1..c2ddab1 100644
--- a/drivers/usb/Kconfig
+++ b/drivers/usb/Kconfig
@@ -45,7 +45,7 @@
 	default y if STB03xxx
 	default y if PPC_MPC52xx
 	# MIPS:
-	default y if SOC_AU1X00
+	default y if MIPS_ALCHEMY
 	# SH:
 	default y if CPU_SUBTYPE_SH7720
 	default y if CPU_SUBTYPE_SH7721