ARM: VIC: remove non MULTI_IRQ_HANDLER support

Now that all platforms are converted to MULTI_IRQ_HANDLER, remove the
legacy support.

Tested-by: Thomas Abraham <thomas.abraham@linaro.org>
Signed-off-by: Jamie Iles <jamie@jamieiles.com>
diff --git a/arch/arm/common/Kconfig b/arch/arm/common/Kconfig
index 10ca974..81a933e 100644
--- a/arch/arm/common/Kconfig
+++ b/arch/arm/common/Kconfig
@@ -8,6 +8,7 @@
 
 config ARM_VIC
 	select IRQ_DOMAIN
+	select MULTI_IRQ_HANDLER
 	bool
 
 config ARM_VIC_NR