Cleanup and extend watch dog's reset-cause logic #1015
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The watchdog is now able to distinguish 4 reset causes:
WDT_RCAUSE_EXT(0b00): Reset caused by external reset signal/pinWDT_RCAUSE_OCD(0b01): Reset caused by on-chip debuggerWDT_RCAUSE_TMO(0b10): Reset caused by watchdog timeoutWDT_RCAUSE_ACC(0b11): Reset caused by illegal watchdog access (strict mode) - invalid reset password or a write attempt to the locked configuration register