soc/tegra: fuse: Add stubs needed for compile-testing

Add missing stubs that will allow Tegra memory driver to be compile-tested
by kernel build bots.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

include/soc/tegra/fuse.h

@@ -52,14 +52,28 @@ struct tegra_sku_info {
 	enum tegra_revision revision;
 };
 
+#ifdef CONFIG_ARCH_TEGRA
+extern struct tegra_sku_info tegra_sku_info;
 u32 tegra_read_straps(void);
 u32 tegra_read_ram_code(void);
 int tegra_fuse_readl(unsigned long offset, u32 *value);
-
-#ifdef CONFIG_ARCH_TEGRA
-extern struct tegra_sku_info tegra_sku_info;
 #else
 static struct tegra_sku_info tegra_sku_info __maybe_unused;
+
+static inline u32 tegra_read_straps(void)
+{
+	return 0;
+}
+
+static inline u32 tegra_read_ram_code(void)
+{
+	return 0;
+}
+
+static inline int tegra_fuse_readl(unsigned long offset, u32 *value)
+{
+	return -ENODEV;
+}
 #endif
 
 struct device *tegra_soc_device_register(void);