generic: sycl: Change to indexing in conv kernel

[ShanoToni]

Description

Changes to the sycl convolution kernel resolve failing benchdnn tests:

--mode-modifier=P --conv --engine=gpu --allow-enum-tags-only=false --check-ref-impl=true --dt=u8:s8:u8 --strides=903168x1x4032x9::6422528x1x28672x128 g1mb1ic3ih224oc64oh112kh7sh2ph3n"resnet_50:conv1"

--mode-modifier=P --conv --engine=gpu --allow-enum-tags-only=false --check-ref-impl=true --dt=u8:s8:u8 --strides=903168x1x4032x9::6422528x1x28672x128 g1mb16ic3ih224oc64oh112kh7sh2ph3n"resnet_50:conv1"

--mode-modifier=P --conv --engine=gpu --allow-enum-tags-only=false --check-ref-impl=true --dt=f16:f16:f16 --strides=903168x1x4032x9::6422528x1x28672x128 g1mb1ic3ih224oc64oh112kh7sh2ph3n"resnet_50:conv1"

--mode-modifier=P --conv --engine=gpu --allow-enum-tags-only=false --check-ref-impl=true --dt=f16:f16:f16 --strides=903168x1x4032x9::6422528x1x28672x128 g1mb16ic3ih224oc64oh112kh7sh2ph3n"resnet_50:conv1"

--mode-modifier=P --conv --engine=gpu --allow-enum-tags-only=false --check-ref-impl=true --strides=903168x1x4032x9::6422528x1x28672x128 g1mb1ic3ih224oc64oh112kh7sh2ph3n"resnet_50:conv1"

 --mode-modifier=P --conv --engine=gpu --allow-enum-tags-only=false --check-ref-impl=true --strides=903168x1x4032x9::6422528x1x28672x128 g1mb16ic3ih224oc64oh112kh7sh2ph3n"resnet_50:conv1"

--mode-modifier=P --conv --engine=gpu --allow-enum-tags-only=false --check-ref-impl=true --dir=BWD_D --dt=u8:s8:u8 --strides=903168x1x4032x9::6422528x1x28672x128 g1mb1ic3ih224oc64oh112kh7sh2ph3n"resnet_50:conv1"

see MFDNN-13275

Checklist

General

• [ x ] Do all unit and benchdnn tests (make test and make test_benchdnn_*) pass locally for each commit?
• [ x ] Have you formatted the code using clang-format?

[ShanoToni]

make test
disable build_vendor_intel
disable test_device_cpu
enable build_vendor_generic
enable arch_gpu_ampere
enable compiler_icx-oss

[ShanoToni]

make test
disable build_vendor_intel
disable test_device_cpu
enable build_vendor_generic
enable arch_gpu_ampere
enable compiler_icx-oss