Fix: honor "user" attribute for array/sequence of user integers

Fix: honor "user" attribute for array/sequence of user integers

The macro _lttng_kernel_static_type_integer_from_type() should map to
_lttng_kernel_static_type_integer() to pass the "_user" attribute.
Otherwise, userspace fields such as pipe2's system call fildes field (a
ctf_user_array()) can trigger NULL pointer exceptions and read arbitrary
kernel memory if the pipe2 system call receives a bogus pointer as input
while filtering/capture is accessing this field.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I44276d751b822f214804184d1ce4d9b10b47d89d