Partially revert "usb: Kconfig: using select for USB_COMMON dependency"

Partially revert "usb: Kconfig: using select for USB_COMMON dependency"

This reverts commit e02fd0cd4a479561cf82768e42868db92f819ce3 for
USB_LED_TRIG.  This config symbol has bool type and enables extra code
in usb_common itself, not a separate driver.  Enabling it should not
force usb_common to be built-in!

Fixes: e02fd0cd4a47 ("usb: Kconfig: using select for USB_COMMON dependency")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Salvatore Bonaccorso <carnil@debian.org>
Link: https://lore.kernel.org/r/20210921143442.340087-1-carnil@debian.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>