Rename Q8 microkernels and operators to QU8

- Indicate unsigned datatype
- Make space for QS8 with signed quantization

PiperOrigin-RevId: 321275708
diff --git a/scripts/generate-tests.sh b/scripts/generate-tests.sh
index aeb897c..edf8549 100755
--- a/scripts/generate-tests.sh
+++ b/scripts/generate-tests.sh
@@ -4,10 +4,10 @@
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
 
-### Tests for Q8 micro-kernels
-tools/generate-gemm-test.py --spec test/q8-gemm-minmax.yaml --output test/q8-gemm-minmax.cc
-tools/generate-gemm-test.py --spec test/q8-igemm-minmax.yaml --output test/q8-igemm-minmax.cc
-tools/generate-dwconv-test.py --spec test/q8-dwconv-minmax.yaml --output test/q8-dwconv-minmax.cc
+### Tests for QU8 micro-kernels
+tools/generate-gemm-test.py --spec test/qu8-gemm-minmax.yaml --output test/qu8-gemm-minmax.cc
+tools/generate-gemm-test.py --spec test/qu8-igemm-minmax.yaml --output test/qu8-igemm-minmax.cc
+tools/generate-dwconv-test.py --spec test/qu8-dwconv-minmax.yaml --output test/qu8-dwconv-minmax.cc
 
 ### Tests for U8 micro-kernels
 tools/generate-clamp-test.py --spec test/u8-clamp.yaml --output test/u8-clamp.cc
@@ -20,7 +20,7 @@
 tools/generate-maxpool-test.py --spec test/f32-maxpool-minmax.yaml --output test/f32-maxpool-minmax.cc
 
 ### Tests for AvgPool micro-kernels
-tools/generate-avgpool-test.py --spec test/q8-avgpool-minmax.yaml --output test/q8-avgpool-minmax.cc
+tools/generate-avgpool-test.py --spec test/qu8-avgpool-minmax.yaml --output test/qu8-avgpool-minmax.cc
 tools/generate-avgpool-test.py --spec test/f32-avgpool-minmax.yaml --output test/f32-avgpool-minmax.cc
 
 ### Tests for GAvgPool micro-kernels