drivers/lcd/st7565.c: Use ST7565_POWERCTRL_INT instead of ST7565_POWERCTRL_BRF

Approved-by: Gregory Nutt <gnutt@nuttx.org>

The attached .patch implements DMA support for the stm32f4 I2C. Max and I have verified that it works on our systems.

sem_holder:Clean up from Review

Approved-by: Gregory Nutt <gnutt@nuttx.org>

Spelling and backward DEBUGASSERT along with one gem

  if (sem->holder[0].htcb != NULL || sem->holder[**1**].htcb != NULL)

XMC4xxx:  Clean up problems associated with USIC initialization.  USIC still does not work in UART mode.

- fixed wrong assert on udp dgram send

Approved-by: Gregory Nutt <gnutt@nuttx.org>

drivers/lcd/st7565.c:  Extend to include support for the AQM_1248A

Approved-by: Gregory Nutt <gnutt@nuttx.org>

drivers/audio/wm8904: WM8904 has same problem as that fixed by Juha Niskanen in the MaxTouch driver.

put_reg/get_reg function was overriding i2c transfer error code with i2creset return value, that lead to OK status although actual transfer failed.

Signed-off-by: Juha Niskanen <juha.niskanen@haltian.com>
Reported-by: Harri Luhtala <harri.luhtala@haltian.com>

fix a typo

Approved-by: Gregory Nutt <gnutt@nuttx.org>

XMC4xxx: Simply some USIC logic, add USIC interface to disable a channel.  Add USIC enable logic to UART configuration (a lot more to do there).

STM32F3: Add COMP support

Approved-by: Gregory Nutt <gnutt@nuttx.org>