usb: Remove CMD_USB dependency for common code

Common USB code is built whenever USB is enabled (in non-SPL builds).
The USB uclass is built whenever (SPL_)DM_USB is enabled. Both need to
be independent from CMD_USB.
Signed-off-by: NSven Schwermer <sven@svenschwermer.de>

common/Makefile

@@ -33,7 +33,7 @@ obj-$(CONFIG_MII) += miiphyutil.o
 obj-$(CONFIG_CMD_MII) += miiphyutil.o
 obj-$(CONFIG_PHYLIB) += miiphyutil.o
 
-ifdef CONFIG_CMD_USB
+ifdef CONFIG_USB
 obj-y += usb.o usb_hub.o
 obj-$(CONFIG_USB_STORAGE) += usb_storage.o
 endif

drivers/usb/host/Makefile

@@ -4,7 +4,7 @@
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 
 ifdef CONFIG_$(SPL_)DM_USB
-obj-$(CONFIG_CMD_USB) += usb-uclass.o
+obj-y += usb-uclass.o
 obj-$(CONFIG_SANDBOX) += usb-sandbox.o
 endif