rapidio: add modular rapidio core build into powerpc and mips branches

Allow modular build option for RapidIO subsystem core in MIPS and PowerPC
architectural branches.

At this moment modular RapidIO subsystem build is enabled only for
platforms that use PCI/PCIe based RapidIO controllers (e.g.  Tsi721).
Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Jean Delvare <jdelvare@suse.de>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Li Yang <leoli@freescale.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/mips/Kconfig

@@ -2430,7 +2430,7 @@ source "drivers/pcmcia/Kconfig"
 source "drivers/pci/hotplug/Kconfig"
 
 config RAPIDIO
-	bool "RapidIO support"
+	tristate "RapidIO support"
 	depends on PCI
 	default n
 	help

arch/powerpc/Kconfig

@@ -794,7 +794,7 @@ config HAS_RAPIDIO
 	default n
 
 config RAPIDIO
-	bool "RapidIO support"
+	tristate "RapidIO support"
 	depends on HAS_RAPIDIO || PCI
 	help
 	  If you say Y here, the kernel will include drivers and
@@ -802,7 +802,7 @@ config RAPIDIO
 
 config FSL_RIO
 	bool "Freescale Embedded SRIO Controller support"
-	depends on RAPIDIO && HAS_RAPIDIO
+	depends on RAPIDIO = y && HAS_RAPIDIO
 	default "n"
 	---help---
 	  Include support for RapidIO controller on Freescale embedded