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In Asynchronous Fractional baud rate mode, the baud rate can not be greater than the source frequency divided by the oversampling (8, 16). Currently we are always using 16x oversampling. This makes it impossible to e.g. set a 2 MHz UART baud rate on the 16 MHz `saml10-xpro`. With this change, the oversampling is automatically reduced to 8x which allows us to set 16 MHz / 8 -> 2 MHz baud rate.