Revert "pan/bi: Fix load_const of 1-bit booleans"

This reverts commit 29d319c7.

Now that we use nir_lower_bool_to_bitsize, we don't see 1-bit booleans
anymore, so the issue this fixed doesn't apply. Actually, that issue was
(in part) why I started looking into boolean handling in the first
place.

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
103 jobs for !14576 with lower-bool-new in 17 minutes and 21 seconds (queued for 19 seconds)
merge request
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panfrost-g72-gl:arm64 1/3 Arm
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results/: found 17 matching files and directories

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id=17676260 responseStatus=201 Created token=T7Td_SkH
Cleaning up file based variables
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panfrost-g52-piglit-gl:arm64 2/2 Arm
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$ wget -q "https://${JOB_RESULTS_PATH}" -O- | tar -xz
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results/: found 16 matching files and directories

Uploading artifacts as "archive" to coordinator... ok
id=17676259 responseStatus=201 Created token=S5RjNLkw
Cleaning up file based variables
ERROR: Job failed: exit code 1
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panfrost-g52-gl:arm64 1/3 Arm
Running after_script
Running after script...
$ wget -q "https://${JOB_RESULTS_PATH}" -O- | tar -xz
Uploading artifacts for failed job
Uploading artifacts...
results/: found 17 matching files and directories

Uploading artifacts as "archive" to coordinator... ok
id=17676254 responseStatus=201 Created token=1bsoRTMx
Cleaning up file based variables
ERROR: Job failed: exit code 1