update zh-cn/device-dev/porting/porting-stm32mp15xx-on-smallsystem.md.

Signed-off-by: N Austin23 <liaozhiqi7@huawei.com>

update zh-cn/device-dev/porting/porting-stm32mp15xx-on-smallsystem.md.
Signed-off-by: N Austin23 <liaozhiqi7@huawei.com>
02a45b53 · Austin · Gitee · a7eb8ad9 · 02a45b53
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 ### SoC芯片平台HDF驱动移植

-驱动适配相关文件放置在`device/soc/st/common/platform`中，所有的驱动都是通过`HDF`机制加载，本章节以`gpio`为例进行详细说明。
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-#### GPIO驱动适配
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+驱动适配相关文件放置在`device/soc/st/common/platform`中，所有的驱动都是通过`HDF`机制加载，本章节以GPIO驱动适配为例进行详细说明。

 1. 在`//device/soc/st/common/platform/gpio/BUILD.gn`文件中，描述了stm32mp1xx `gpio`驱动的编译适配。如下：