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Follow JESD220G, support a WB buffer resize function through sysfs. The host can obtain resize hint and resize status, and enable the resize operation. Add three sysfs nodes: 1. wb_resize_enable 2. wb_resize_hint 3. wb_resize_status The detailed definition of the three nodes can be found in the sysfs documentation. Signed-off-by: Huan Tang <tanghuan@vivo.com> Signed-off-by: Lu Hongfei <luhongfei@vivo.com> Link: https://lore.kernel.org/r/20250411092924.1116-1-tanghuan@vivo.com Reviewed-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>