carl9170: import hw/fw header updates

carl9170: import hw/fw header updates

This patch imports all shared header changes
from carl9170fw.git.

 * add some strategic __aligned(4).
   This allows the compiler generate optimized code for
   architectures which can't access (unaligned/packed)
   data efficiently.
   ("ath9k_hw: optimize all descriptor access functions")

 * add a forgotten __CARL9170FW__ ifdef around
   a private firmware-internal struct.

 * GET_VAL macro helper
   Very useful for extracting data out of the
   bit-packed PHY registers.

 * cosmetic changes
   e.g.: _CCA_MINCCA_ to just _CCA_MIN_.

 * version bump 1.8.8.3 -> 1.9.0.

Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>