USB: f_ccid: Unblock ccid_ctrl_read() during disconnect

Whenever userspace calls read system call for ctrl_dev, ccid driver
waits till it receives control request from host. Once it receives
control data, it unblocks read and passes data to userspace. But if
cable is disconnected, then ccid driver is not unblocking read due
to which next open of ctrl_dev failing. This results in ccid functionality
not working after cable reconnection as userspace not able to open
ctrl_dev. Hence fix the issue by checking for online status and if
online flag is cleared, unblock read and return -ENODEV.

Also align request buffer length to OUT endpoint's max packet size,
when userspace tries to queue buffer length that is not multiple of
OUT endpoint max packet as USB controller expects length multiple of
maxpacket.

Change-Id: I97d1819c21919b6c66b7a1e5fbf1c452ec691639
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>