[opus] Fix ARM cpu selection if Intrinsics are enabled but not asm

[Jonathan Lennox]

The ARM implementation of opus_select_arch wants to verify that a given CPU architecture also implies all lower-capability architectures.

Unfortunately, the ARM opus_cpu_capabilities function only currently checks for those architectures that are enabled in the configuration, and thus —disable-asm — or a floating-point build — doesn’t check for Media or EDSP.

Thus, RTCD for these configurations doesn’t end up taking advantage of Neon Intrinsics support.

The attached patch should fix this, by checking for a CPU feature if the feature or any higher feature is enabled in the configuration.

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