raspberrypi inclusion
category: feature
bugzilla: 50432

------------------------------

This patch adjusts following serial related patches for
raspberry pi on non-Raspberry Pi platforms, using specific
config CONFIG_OPENEULER_RASPBERRYPI to distinguish them:

239d5fc7 amba_pl011: Round input clock up
05884dbf amba_pl011: Insert mb() for correct FIFO handling
1309c3c7 amba_pl011: Add cts-event-workaround DT property
Signed-off-by: NFang Yafen <yafen@iscas.ac.cn>
Reviewed-by: NXie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>