hw/mcu/da1469x: hal_flash manual mode enhanced
hw/mcu/da1469x: hal_flash manual mode enhanced

- returning to automode is done by restoring original value of
  QSPIC_CTRLMODE_REG. This will take care of correct bus width
  and D2 D3 lines state. There is no automatic switch to quad mode
  any more.
- switching to manual mode sequence of call was made:
  da1469x_qspi_mode_manual()
  da1469x_qspi_mode_single()
  now da1469x_qspi_mode_manual() will automatically switch to single mode
  and additionally it will send break sequence that should end any
  continues read mode.
  previous code sent only one byte in single mode that is not enough
  to leave dual continuous read.
- da1469x_qspi_mode_dual() and da1469x_qspi_mode_single() now setup
  controller in requested state without sending break sequence that
  was sent when manual mode was entered.

mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core