maple_tree: inline mas_spanning_rebalance_loop() into mas_wr_spanning_rebalance()

maple_tree: inline mas_spanning_rebalance_loop() into mas_wr_spanning_rebalance()

Just copy the code and replace count with height.  This is done to avoid
affecting other code paths into mas_spanning_rebalance_loop() for the next
change.

No functional change intended.

Link: https://lkml.kernel.org/r/20260130205935.2559335-14-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Alice Ryhl <aliceryhl@google.com>
Cc: Andrew Ballance <andrewjballance@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Christian Kujau <lists@nerdbynature.de>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: SeongJae Park <sj@kernel.org>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>