anv/gfx12: Enable non-zero fast clears for non-FCV CCS_E

Anvil disables fast color clears for non-zero colors for ISL_AUX_USAGE_CCS_E on gfx12.

Naively enabling it increases a benchmark score by 1.16x (24075 / 20768): Gfxbench TRex 5.1 Offscreen, Raptorlake, zink, 1920x1080.

It's disabled by this code:

@@file anv_image.c
@@func can_fast_clear_with_non_zero_color

    /* Turning on non zero fast clears for CCS_E introduces a performance    
     * regression for games such as F1 22 and RDR2 by introducing additional 
     * partial resolves. Let's turn non zero fast clears back off till we can
     * fix performance.                                                      
     */                                                                      
    if (image->planes[plane].aux_usage == ISL_AUX_USAGE_CCS_E &&             
        devinfo->ver >= 12)                                                  
       return false;                                                         

When re-enabling, we must take care to not hit the perf regression in the code comment.