usb: gadget: composite: Set default value of bcdUSB as 0x0200

When l1_supported is false and USB gadget max speed is high speed
only, composite framework is not updating bcdUSB as 0x0200 which
results into bcdUSB set as 0x00 used as part of device descriptors.
This is against USB specification and also USB host may behave
differently. Fix this issue by setting default value of bcdUSB as
0x0200.

CRs-Fixed: 1006330
Change-Id: I8330f0609540d97f5bca78c42ed193537f497a73
Signed-off-by: Mayank Rana <mrana@codeaurora.org>