v3dv: increase BO allocation size when growing CLs

v3dv: increase BO allocation size when growing CLs

This can significantly reduce the number of allocations required
to record large command buffers with thousands of draw calls and
it improves significantly vkoverhead's results.

fps_avg helped:   serious_sam_trace01_1280x720.gfxr:                17.96 -> 18.50 (3.01%)
fps_avg helped:   vehicle-game-2.gfxr:                              9.09 -> 9.33 (2.67%)
fps_avg helped:   ue4_shooter_game_high_quality.gfxr:               17.40 -> 17.66 (1.48%)
fps_avg helped:   ue4_shooter_game_low_quality.gfxr:                25.25 -> 25.61 (1.44%)
fps_avg helped:   ue4_sun_temple.gfxr:                              24.93 -> 25.15 (0.86%)
fps_avg helped:   vkQuake_capture_frames_1_through_1200.gfxr:       52.54 -> 52.95 (0.78%)
fps_avg helped:   rbdoom-3-bfg_capture.gfxr:                        13.87 -> 13.96 (0.69%)
fps_avg helped:   sponza_demo02_800x600.gfxr:                       19.59 -> 19.63 (0.21%)

fps_avg HURT:   ue4_shooter_game_shooting_high_quality.gfxr:      19.14 -> 18.95 (-0.98%)
fps_avg HURT:   sponza_demo01_800x600.gfxr:                       20.03 -> 20 (-0.09%)
fps_avg HURT:   quake3e_capture_frames_1_through_1800.gfxr:       57.34 -> 57.34 (-0.01%)
fps_avg HURT:   serious_sam_trace02_1280x720.gfxr:                38.27 -> 38.27 (-0.01%)

total fps_min in shared programs: 311.74 -> 313.91 (0.69%)
fps_min in affected programs: 311.74 -> 313.91 (0.69%)
helped: 10
HURT: 2

total fps_max in shared programs: 319.54 -> 320.24 (0.22%)
fps_max in affected programs: 319.54 -> 320.24 (0.22%)
helped: 6
HURT: 6

total fps_avg in shared programs: 315.41 -> 317.36 (0.62%)
fps_avg in affected programs: 315.41 -> 317.36 (0.62%)
helped: 8
HURT: 4

Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20787>