staging: most: fix up movement of USB driver

When moving the most usb driver out of staging, we forgot to remove the
subdirectory out of the staging Makefile as well.

Fixes: 97a6f77 ("drivers: most: add USB adapter driver")
Cc: Christian Gromm <[email protected]>
Reported-by: Michael Straube <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: gregkh

drivers/staging/most/Makefile

@@ -6,4 +6,3 @@ obj-$(CONFIG_MOST_SOUND)	+= sound/
 obj-$(CONFIG_MOST_VIDEO)	+= video/
 obj-$(CONFIG_MOST_DIM2)	+= dim2/
 obj-$(CONFIG_MOST_I2C)	+= i2c/
-obj-$(CONFIG_MOST_USB)	+= usb/