Tegra: Split tegra_get_chip_type() into soc & sku funcs

As suggested by Stephen Warren, use tegra_get_chip() to return
the pure CHIPID for a Tegra SoC (i.e. 0x20 for Tegra20, 0x30 for
Tegra30, etc.) and rename tegra_get_chip_type() to reflect its true
function, i.e. tegra_get_chip_sku(), which returns an ID like
TEGRA_SOC_T25, TEGRA_SOC_T33, etc.

Signed-off-by: Tom Warren <twarren@nvidia.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
diff --git a/arch/arm/cpu/arm720t/tegra-common/cpu.h b/arch/arm/cpu/arm720t/tegra-common/cpu.h
index e8e05d7..f9bfb32 100644
--- a/arch/arm/cpu/arm720t/tegra-common/cpu.h
+++ b/arch/arm/cpu/arm720t/tegra-common/cpu.h
@@ -80,5 +80,7 @@
 void powerup_cpu(void);
 void reset_A9_cpu(int reset);
 void start_cpu(u32 reset_vector);
-int tegra_get_chip_type(void);
+int tegra_get_chip(void);
+int tegra_get_sku_info(void);
+int tegra_get_chip_sku(void);
 void adjust_pllp_out_freqs(void);