Increasing tolerance for Preproc4lpiTest set on ARM

[anna-khakimova]

The Resize gives calculation deviation on ARM. So the Resize test tolerance should be increased up to 2.
Fix for issue:
#19122

Xforce_builders=Linux AVX2,Linux32,Win32,Custom,Custom Win,Custom Mac
build_gapi_standalone:Linux x64=ade-0.1.1f
build_gapi_standalone:Win64=ade-0.1.1f
Xbuild_gapi_standalone:Mac=ade-0.1.1f
build_gapi_standalone:Linux x64 Debug=ade-0.1.1f

build_image:Custom=centos:7
buildworker:Custom=linux-1
build_gapi_standalone:Custom=ade-0.1.1f

Xbuild_image:Custom=ubuntu-openvino-2021.3.0:20.04
build_image:Custom Win=openvino-2021.4.1
build_image:Custom Mac=openvino-2021.2.0

buildworker:Custom Win=windows-3

test_modules:Custom=gapi,python2,python3,java
test_modules:Custom Win=gapi,python2,python3,java
test_modules:Custom Mac=gapi,python2,python3,java

buildworker:Custom=linux-1
# disabled due high memory usage: test_opencl:Custom=ON
Xtest_opencl:Custom=OFF
Xtest_bigdata:Custom=1
Xtest_filter:Custom=*

CPU_BASELINE:Custom Win=AVX512_SKX
CPU_BASELINE:Custom=SSE4_2

[dmatveev]

LGTM but a comment in the test (explaining the accuracy difference on ARM) would help further generations a lot

[asmorkalov]

@dmatveev Should I merge the PR now, or you want to investigate x86 vs arm issue?

[dmatveev]

@asmorkalov you can merge if it helps (but as far as I know it doesn't). Waiting for @anna-khakimova to follow-up