Relocate and redefine usb_mode enum

Relocate and redefine usb_mode enum

The VCONFKEY_USB_CUR_MODE and VCONFKEY_USB_SEL_MODE will be changed to
have combination of usb functions, which is able to combine any type of
functions, not only the predefined set of combinations. The predefined
set of combination have been removed.

The values are redefined in capi-system-device.
 - USB_GADGET_FUNC_NONE  = 0x00
 - USB_GADGET_FUNC_SDB   = 0x01
 - USB_GADGET_FUNC_MTP   = 0x02
 - USB_GADGET_FUNC_RNDIS = 0x04
 - USB_GADGET_FUNC_ACM   = 0x08
 - USB_GADGET_FUNC_DIAG  = 0x10
 - USB_GADGET_FUNC_RMNET = 0x20

Modify default VCONFKEY_USB_SEL_MODE to 0x0b, which corresponds to the
previous default function combination, SDB(0x01)|MTP(0x02)|ACM(0x08).

Change-Id: I65c1309419c7d5d4a6a501005ba5a8672114d43e
Signed-off-by: Youngjae Cho <y0.cho@samsung.com>