PCI: tegra: Remove unused struct tegra_pcie_bus

Following the code refactoring completed in the commit 1fd92928
("PCI: tegra: Refactor configuration space mapping code") there are no
more known users of struct tegra_pcie_bus.

Thus, remove declaration of struct tegra_pcie_bus as it's no longer
needed and does not have any existing users left.

Link: https://lore.kernel.org/r/20210704235733.2514131-1-kw@linux.comSigned-off-by: NKrzysztof Wilczyński <kw@linux.com>
Signed-off-by: NLorenzo Pieralisi <lorenzo.pieralisi@arm.com>

drivers/pci/controller/pci-tegra.c

@@ -372,11 +372,6 @@ struct tegra_pcie_port {
 	struct gpio_desc *reset_gpio;
 };
 
-struct tegra_pcie_bus {
-	struct list_head list;
-	unsigned int nr;
-};
-
 static inline void afi_writel(struct tegra_pcie *pcie, u32 value,
 			      unsigned long offset)
 {