PCI: Rename "PCI Express support" kconfig title

The previous option title "PCI Express support" is confusing.  The name
seems to imply this option is required to get PCIe support, which is not
true.

Fix it to "PCI Express Port Bus support" which is more accurate.
Signed-off-by: NEzequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>

drivers/pci/pcie/Kconfig

@@ -2,7 +2,7 @@
 # PCI Express Port Bus Configuration
 #
 config PCIEPORTBUS
-	bool "PCI Express support"
+	bool "PCI Express Port Bus support"
 	depends on PCI
 	help
 	  This automatically enables PCI Express Port Bus support. Users can