libusbg: Separate parsing gadget attributes and strings.
libusbg: Separate parsing gadget attributes and strings.

Gadget attributes and strings are logically independent,
so they should be initialized in separate functions.

Signed-off-by: Krzysztof Opasiak <8064eda6f94b3817252b7d7649cf754592f63500@samsung.com>

pszewczyk/libusbg,pszewczyk/libusbg