- Implement command interface to query ABM SW algorithm and
   HW caps. This is primarily intended as a debugging interface

 - Add new definitions for max number of histogram bins and ABM
   curve segments available in hardware

 - Add structures to retrieve caps to describe ABM HW caps
   since not all ASICs have the same number of cure segments and
   bins
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Anthony Koo <anthony.koo@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>