usb: USB_ARCH_HAS_HCD Kconfig option removal

The USB_ARCH_HAS_HCD currently serves no purpose and adds some confusion to the
required Kconfig options that are required to have USB support.

Dropping it makes things easier and doesn't break anything, since it was unused
anyways.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig
index 716dad4..fed510b 100644
--- a/drivers/usb/Kconfig
+++ b/drivers/usb/Kconfig
@@ -1,10 +1,7 @@
 menu USB
-config USB_ARCH_HAS_HCD
-	def_bool y
 
 config USB
 	bool "Support for Host-side USB"
-	depends on USB_ARCH_HAS_HCD
 	---help---
 	  Universal Serial Bus (USB) is a specification for a serial bus
 	  subsystem which offers higher speeds and more features than the