Readme say set ANDROID_SDK

[rohansjoshi]

Summary: The README should say to set ANDROID_SDK (not ANDROID_HOME, which is set inside the script build_android_library.sh)

Reviewed By: cccclai

Differential Revision: D79387440

[pytorch-bot]

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❌ 3 New Failures, 1 Unrelated Failure

As of commit 1850d99 with merge base 3e70463 ():

NEW FAILURES - The following jobs have failed:

• Build documentation / build (buck2) / Build doc (gh)
  At least one of the pre-conditions you specified did not hold
• pull / test-moshi-linux / linux-job (gh)
  RuntimeError: Command docker exec -t cd02f1336dc3c23625e8decf081f7d8d452b50de11681a89f4b12097f8dc0f27 /exec failed with exit code 1
• pull / unittest-editable / macos / macos-job (gh)
  backends/xnnpack/test/ops/test_conv1d.py::TestConv1d::test_qs8_conv1d_batchnorm_seq

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / test-openvino-linux / linux-job (gh) (trunk failure)
  AttributeError: '_OpNamespace' 'quantized_decomposed' object has no attribute 'convert_element_type'

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This pull request was exported from Phabricator. Differential Revision: D79387440