get_architecture_value and ndk_platform_triple is no longer used in test/lit.cfg and can be removed

[WeZZard]

Description
I configured pylance for lit config scripts in the test directory and find that in current main branch, at the line 1572 of the file test/lit.cfg there is:

            result = kwards["aarch64"]

which should be:

            result = kwargs["aarch64"]

which make the variable ndk_platform_triple below receives incorrect value.

The variable ndk_platform_triple is introduced in the pull request [android] Modify test scripts for aarch64 and modern NDKs. but the use sites of the variable ndk_platform_triple are removed in the pull request [android] Modify test scripts for aarch64 and modern NDKs. and [android] Update to NDK 23b. Thus the get_architecture_value function and ndk_platform_triple could be removed now.

Environment
swift main branch, test/lit.cfg

[finagolfin]

You are correct. The issue is that this config has not been used in awhile, but the new community Android CI uses it again, swiftlang/swift-community-hosted-continuous-integration#55. We'll look at fixing this alongside #78350, let us know if we forget.