driver core: Set default deferred_probe_timeout back to 0.

Since we had to effectively reverted
commit 35a672363ab3 ("driver core: Ensure wait_for_device_probe() waits
until the deferred_probe_timeout fires") in an earlier patch, a non-zero
deferred_probe_timeout will break NFS rootfs mounting [1] again. So, set
the default back to zero until we can fix that.

[1] - https://lore.kernel.org/lkml/[e-mail]/

Fixes: 2b28a1a84a0e ("driver core: Extend deferred probe timeout on driver registration")
Cc: Mark Brown <[e-mail]>
Cc: Rob Herring <[e-mail]>
Reported-by: Nathan Chancellor <[e-mail]>
Reported-by: Sebastian Andrzej Siewior <[e-mail]>
Tested-by: Geert Uytterhoeven <[e-mail]>
Signed-off-by: Saravana Kannan <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/base/dd.c

···
 }
 DEFINE_SHOW_ATTRIBUTE(deferred_devs);
 
-#ifdef CONFIG_MODULES
-int driver_deferred_probe_timeout = 10;
-#else
 int driver_deferred_probe_timeout;
-#endif
-
 EXPORT_SYMBOL_GPL(driver_deferred_probe_timeout);
 
 static int __init deferred_probe_timeout_setup(char *str)