Drop src/cpu/ indirection for MIPS

Change-Id: I406166e650e07851ab1b293450fa29da8af075d9
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: https://review.coreboot.org/12724
Tested-by: build bot (Jenkins)
Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>

src/cpu/mips/Kconfig

@@ -1,22 +0,0 @@
-#
-# This file is part of the coreboot project.
-#
-# Copyright (C) 2014 Imagination Technologies
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License as
-# published by the Free Software Foundation; version 2 of
-# the License.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-
-config CPU_MIPS
-	bool
-	select ARCH_BOOTBLOCK_MIPS
-	select ARCH_VERSTAGE_MIPS
-	select ARCH_ROMSTAGE_MIPS
-	select ARCH_RAMSTAGE_MIPS

src/soc/imgtec/pistachio/Kconfig

@@ -15,7 +15,10 @@
 #
 
 config CPU_IMGTEC_PISTACHIO
-	select CPU_MIPS
+	select ARCH_BOOTBLOCK_MIPS
+	select ARCH_VERSTAGE_MIPS
+	select ARCH_ROMSTAGE_MIPS
+	select ARCH_RAMSTAGE_MIPS
 	select GENERIC_UDELAY
 	select HAVE_MONOTONIC_TIMER
 	select HAVE_UART_SPECIAL