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STM32F4's GPIO_OTGFS_ID conflict with GPIO_USART1_RX_1 #32

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@lijieamd

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GPIO_OTGFS_ID pin was configured without any predefinition in OTG driver, but GPIO_USART1_RX_1 use the same pin was configured in low level startup before OTG driver initialization, so usart rx not work after OTG driver initialization

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