SAMA5 TWI: Some restructured needed by up_i2creset.  Also timeout needs to vary with the size of the transfer and if debug is on or not

Use sam_pio_forceclk() so that we can read the current state of an open-drain output in the TWI reset logic.

Add a new interface sam_pio_forceclk() that can be used to force PIO clocking on.  I am afraid I was too conservative with PIO clocking in the initial design; this is the price

SAMA5D3/4 HEAP: Add a configuration option to reserve DRAM for a framebuffer when executing out of DRAM.

MXT Driver: Make sure that all return values are checked:  Fix worker thread -- it must hold the MXT device semaphore to access I2C

BCH: Add configurable AES encryption support to block-to-character (BCH) driver.  This allows any block device to be accessed as an encrypted character device.  From  Max Nekludov

NET: Important fix to the read-ahead buffer queue managment: Consumed bytes were being trimmed from the head of the queue, but the queue head itself was not being updated.  From Rony XLN