Revert "zink: redesign the allocation try loop to test all heaps"

This reverts commit eb394f53, which causes the following spam in the zink-radv-(navi|polaris)10-valve jobs:

ERROR - Piglit error: MESA: error: zink: can't allocate 268439552 bytes from heap that's only 268435456 bytes!

Signed-off-by: Martin Roukala (né Peres) martin.roukala@mupuf.org