Tegra: public interfaces to get the chip's major/minor versions

This patch opens up the interfaces to read the chip's major/minor versions
for all Tegra drivers to use.

Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
diff --git a/plat/nvidia/tegra/include/tegra_platform.h b/plat/nvidia/tegra/include/tegra_platform.h
index f9d7b60..a2813a8 100644
--- a/plat/nvidia/tegra/include/tegra_platform.h
+++ b/plat/nvidia/tegra/include/tegra_platform.h
@@ -34,6 +34,12 @@
 #include <sys/cdefs.h>
 
 /*
+ * Tegra chip major/minor version
+ */
+uint32_t tegra_get_chipid_major(void);
+uint32_t tegra_get_chipid_minor(void);
+
+/*
  * Tegra chip identifiers
  */
 uint8_t tegra_is_t132(void);