msm: msm_bus: Enable support for multi-tiered requests

Currently only single-tiered requests are forwarded over
gateways. This raises the priority of all masters on a
particular fabric which is undesired.

This patch enables forwarding multi-tiered requests
between fabrics.

Signed-off-by: Gagan Mac <gmac@codeaurora.org>
diff --git a/arch/arm/mach-msm/Kconfig b/arch/arm/mach-msm/Kconfig
index 1e95ce9..36b811d 100644
--- a/arch/arm/mach-msm/Kconfig
+++ b/arch/arm/mach-msm/Kconfig
@@ -1510,6 +1510,10 @@
 	bool "Bus scaling driver"
 	default n
 
+config MSM_BUS_RPM_MULTI_TIER_ENABLED
+	bool "RPM Multi-tiering Configuration"
+	depends on MSM_BUS_SCALING
+
 config MSM_WATCHDOG
 	bool "MSM Watchdog Support"
 	depends on ARCH_MSM8X60 || ARCH_MSM8960