UPSTREAM: binder: Refactor binder_node print synchronization

The binder driver outputs information about each dead binder node by
iterating over the dead nodes list, and it prints the state of each live
node in the system by traversing each binder_proc's proc->nodes tree.
Both cases require similar logic to maintain the global lock ordering
while accessing each node.

Create a helper function to synchronize around printing binder nodes in
a list. Opportunistically make minor cosmetic changes to binder print
functions.

Acked-by: Carlos Llamas <cmllamas@google.com>
Signed-off-by: "Tiffany Y. Yang" <ynaffit@google.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Link: https://lore.kernel.org/r/20250510013435.1520671-5-ynaffit@google.com


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

Bug: 316970771
(cherry picked from commit 91f1bbaa)
Change-Id: Iae546a847ca138ddfffcdc24faf075b325a54640
Signed-off-by: "Tiffany Yang" <ynaffit@google.com>