subsys: usb: Make HID payload size configurable

The payload size was hardcoded to 64.
This commit adds a configuration option to choose > 64 bytes
when the device allows larger packets.
A configuration option USB_HID_MAX_PAYLOAD_SIZE is added in
subsys/usb/class/hid/Kconfig
The default value is set to 64

Signed-off-by: Sathish Kuttan <sathish.k.kuttan@intel.com>