imsm: refactor RAID level handling

imsm: refactor RAID level handling

Add imsm_level_ops struct for better handling and unifying raid level
support. Add helper methods and move "orom_has_raid[...]" methods from
header to source file.

RAID 1e is not supported under Linux, remove RAID 1e associated code.

Refactor imsm_analyze_change() and is_raid_level_supported().
Remove hardcoded check for 4 drives and make devNumChange a multiplier
for RAID 10.

Refactor printing supported raid levels.

Signed-off-by: Mateusz Kusiak <mateusz.kusiak@intel.com>
Signed-off-by: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>