usb: remove redundant 'default n' from Kconfig-s

'default n' is the default value for any bool or tristate Kconfig
setting so there is no need to write it explicitly.

Also since commit f467c5640c ("kconfig: only write '# CONFIG_FOO
is not set' for visible symbols") the Kconfig behavior is the same
regardless of 'default n' being present or not:

    ...
    One side effect of (and the main motivation for) this change is making
    the following two definitions behave exactly the same:

        config FOO
                bool

        config FOO
                bool
                default n

    With this change, neither of these will generate a
    '# CONFIG_FOO is not set' line (assuming FOO isn't selected/implied).
    That might make it clearer to people that a bare 'default n' is
    redundant.
    ...

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/Kconfig

@@ -161,7 +161,6 @@ config USB_EHCI_PCI
 config USB_EHCI_HCD_PMC_MSP
 	tristate "EHCI support for on-chip PMC MSP71xx USB controller"
 	depends on MSP_HAS_USB
-	default n
 	select USB_EHCI_BIG_ENDIAN_DESC
 	select USB_EHCI_BIG_ENDIAN_MMIO
 	---help---
@@ -308,7 +307,6 @@ config USB_CNS3XXX_EHCI
 
 config USB_EHCI_HCD_PLATFORM
 	tristate "Generic EHCI driver for a platform device"
-	default n
 	---help---
 	  Adds an EHCI host driver for a generic platform device, which
 	  provides a memory space and an irq.
@@ -318,7 +316,6 @@ config USB_EHCI_HCD_PLATFORM
 config USB_OCTEON_EHCI
 	bool "Octeon on-chip EHCI support (DEPRECATED)"
 	depends on CAVIUM_OCTEON_SOC
-	default n
 	select USB_EHCI_BIG_ENDIAN_MMIO if CPU_BIG_ENDIAN
 	select USB_EHCI_HCD_PLATFORM
 	help
@@ -526,7 +523,6 @@ config USB_OHCI_HCD_SSB
 	depends on (SSB = y || SSB = USB_OHCI_HCD)
 	select USB_HCD_SSB
 	select USB_OHCI_HCD_PLATFORM
-	default n
 	---help---
 	  This option is deprecated now and the driver was removed, use
 	  USB_HCD_SSB and USB_OHCI_HCD_PLATFORM instead.
@@ -569,7 +565,6 @@ config USB_CNS3XXX_OHCI
 
 config USB_OHCI_HCD_PLATFORM
 	tristate "Generic OHCI driver for a platform device"
-	default n
 	---help---
 	  Adds an OHCI host driver for a generic platform device, which
 	  provides a memory space and an irq.