PCI: dwc: Clean up Kconfig dependencies (PCIE_DW_EP)

The "depends on" Kconfig construct is a no-op in options that
are selected and therefore has no effect. Remove it.

Clean up the users of PCIE_DW_EP and introduce idiom

	depends on PCI_ENDPOINT
	select PCIE_DW_EP

for all of them.

Link: https://lore.kernel.org/r/20210623140103.47818-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

drivers/pci/controller/dwc/Kconfig

@@ -12,7 +12,6 @@ config PCIE_DW_HOST
 
 config PCIE_DW_EP
 	bool
-	depends on PCI_ENDPOINT
 	select PCIE_DW
 
 config PCI_DRA7XX
@@ -37,8 +36,8 @@ config PCI_DRA7XX_HOST
 config PCI_DRA7XX_EP
 	tristate "TI DRA7xx PCIe controller Endpoint Mode"
 	depends on SOC_DRA7XX || COMPILE_TEST
-	depends on PCI_ENDPOINT
 	depends on OF && HAS_IOMEM && TI_PIPE3
+	depends on PCI_ENDPOINT
 	select PCIE_DW_EP
 	select PCI_DRA7XX
 	help