557e2a0b09
Similar to how we have abstract defines for the stop bits, parity and flow control common mode namees, provide abstract flag names for the "standard" flags. This allows us to start using common API code for v1 and v2 uarts For stm32f3, drop the "compatibility" defines that simply pollute the namespace, making it confusingly appear as if f3 has both SR and ISR registers.