ice: Refactor ice_set/get_rss into LUT and key specific functions

Currently ice_set/get_rss are used to set/get the RSS LUT and/or RSS
key. However nearly everywhere these functions are called only the LUT
or key are set/get. Also, making this change reduces how many things
ice_set/get_rss are doing. Fix this by adding ice_set/get_rss_lut and
ice_set/get_rss_key functions.

Also, consolidate all calls for setting/getting the RSS LUT and RSS Key
to use ice_set/get_rss_lut() and ice_set/get_rss_key().

Signed-off-by: Brett Creeley <brett.creeley@intel.com>
Tested-by: Tony Brelinski <tonyx.brelinski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>