ARM: tegra: move Tegra specific code under arch/arm/

This patch moves Tegra specific directory entries
from the toplevel Makefile and spl/Makefile
to arch/arm/cpu/*/Makefile using Kbuild descending feature.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Tom Warren <TWarren@nvidia.com>
diff --git a/arch/arm/cpu/armv7/Makefile b/arch/arm/cpu/armv7/Makefile
index 8a8b602..2c17322 100644
--- a/arch/arm/cpu/armv7/Makefile
+++ b/arch/arm/cpu/armv7/Makefile
@@ -20,3 +20,5 @@
 obj-y	+= nonsec_virt.o
 obj-y	+= virt-v7.o
 endif
+
+obj-$(CONFIG_TEGRA) += tegra-common/