binder: use EINTR for interrupted wait for work

when interrupted by a signal, binder_wait_for_work currently returns
-ERESTARTSYS. This error code isn't propagated to user space, but a way
to handle interruption due to signals must be provided to code using
this API.

Replace this instance of -ERESTARTSYS with -EINTR, which is propagated
to user space.

binder_wait_for_work

Signed-off-by: Marco Ballesio <balejs@google.com>
Signed-off-by: Li Li <dualli@google.com>
Test: built, booted, interrupted a worker thread within
Acked-by: Todd Kjos <tkjos@google.com>
Link: https://lore.kernel.org/r/20210316011630.1121213-3-dualli@chromium.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>