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/spl/Makefile b/spl/Makefile
index d24c1cd..d3dc511 100644
--- a/spl/Makefile
+++ b/spl/Makefile
@@ -109,11 +109,7 @@
 LIBS-y += arch/$(ARCH)/imx-common/libimx-common.o
 endif
 
-ifneq ($(CONFIG_TEGRA),)
-LIBS-y += arch/$(ARCH)/cpu/$(SOC)-common/lib$(SOC)-common.o
-LIBS-y += arch/$(ARCH)/cpu/tegra-common/libcputegra-common.o
-LIBS-y += $(CPUDIR)/tegra-common/libtegra-common.o
-endif
+LIBS-$(CONFIG_ARM) += arch/arm/cpu/libcpu.o
 
 ifneq ($(CONFIG_MX23)$(CONFIG_MX35),)
 LIBS-y += arch/$(ARCH)/imx-common/libimx-common.o