EX-7775 utils: fix cp_comp_type size

EX-7775 utils: fix cp_comp_type size

cp_comp_type should be 8 bits, as llch_compr_type and all associated
variables are declared as u8.
So remove useless cp_comp_enabled and fix code to test for compressed
component with cp_comp_type against LL_COMPR_TYPE_NONE.
And update LL_COMPR_TYPE_MAX value to 255 to avoid conflicts with
future compression types.

Fixes: f43b9ce9af ("EX-6127 osc: osc brw request compression")
Test-Parameters: trivial
Signed-off-by: Sebastien Buisson <sbuisson@ddn.com>
Change-Id: Ia15868ac0ac003b62942540a57f782226ae8c141
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/51481
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>