bgsegm: Enable __popcnt intrinsic for MSVC on ARM to fix LSBP test failure

[pratham-mcw]

This PR enables use of the __popcnt intrinsic for ARM/ARM64 targets when building with MSVC. Previously, these targets(ARM/ARM64) were explicitly excluded using macro guards.

When building OpenCV on Windows on ARM64 with MSVC (cl.exe), the BackgroundSubtractor_LSBP.Accuracy test fails because the code falls into the else block using different bit counting method, which leads to incorrect results and causes the test to fail.

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• [x] I agree to contribute to the project under Apache 2 License.
• [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
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• [ ] There is a reference to the original bug report and related work
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