usb: gadget: ccid: Fix data types of header structures

Replace unsigned long with __u32 as 4 bytes is the length
of field where as unsigned long could be 8 bytes on 64 bit
machine. Also, replace short and char with u16 and u8
respectively for better readability.

Change-Id: I8637f6b32d56d90c01b4453b4677f40d5b865bf6
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>