Use IOException rather than SocketException.

There are various other IOExceptions that can be thrown by either
toRead.getInputStream() or toRead().read(), but any of them indicate
that the concurrent closing of the socket was properly detected.  Some
examples are SSLHandshakeException, if the socket was part way through
the handshake when it was closed, or a bare IOException, if the
socket is closed during getInputStream() and we're reading the
underlying socket rather than the SSLSocket.

Bug: 62640872
Test: cts -m CtsLibcoreTestCases -t libcore.javax.net.ssl.SSLSocketTest#test_SLLSocket_interrupt
Change-Id: I12cb28931fcf9080c84063fc918af88548b6af1a