ARM: tegra: select SPARSE_IRQ

SPARSE_IRQ is required for single zImage support.

With this enabled, we can delete <mach/irqs.h>. This requires removing
one unnecessary include of that file, and hard-coding the PCIe IRQ into
the PCIe driver. This is a hack that will be dealt with as part of
converting the PCIe driver into a true DT-supporting driver.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index ade7e92..22d7a54 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -644,6 +644,7 @@
 	select HAVE_CLK
 	select HAVE_SMP
 	select MIGHT_HAVE_CACHE_L2X0
+	select SPARSE_IRQ
 	select USE_OF
 	help
 	  This enables support for NVIDIA Tegra based systems (Tegra APX,