usb: chipidea: clean up CONFIG_USB_CHIPIDEA_DEBUG reference

Since this configuration option has deleted, cleans up all
its references.
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Reported-by: Valentin Rothberg <valentinrothberg@gmail.com>

Documentation/usb/chipidea.txt

@@ -7,8 +7,8 @@ with 2 Freescale i.MX6Q sabre SD boards.
 ---------------------------------------
 Select CONFIG_USB_OTG_FSM, rebuild kernel Image and modules.
 If you want to check some internal variables for otg fsm,
-select CONFIG_USB_CHIPIDEA_DEBUG, there are 2 files which
-can show otg fsm variables and some controller registers value:
+mount debugfs, there are 2 files which can show otg fsm
+variables and some controller registers value:
 cat /sys/kernel/debug/ci_hdrc.0/otg
 cat /sys/kernel/debug/ci_hdrc.0/registers
 

drivers/usb/chipidea/core.c

@@ -23,7 +23,6 @@
  * - BUS:    bus glue code, bus abstraction layer
  *
  * Compile Options
- * - CONFIG_USB_CHIPIDEA_DEBUG: enable debug facilities
  * - STALL_IN:  non-empty bulk-in pipes cannot be halted
  *              if defined mass storage compliance succeeds but with warnings
  *              => case 4: Hi >  Dn