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Replace the hand-written code to parse each enum from ax_enums with a
templatized function that builds a map from string to attribute value
on-demand.

This saves a little bit of manual effort each time someone updates an enum.

Note that these parsing functions are only used by the automation API.

Bug: None
Change-Id: I4be5e192041cf0686175a20e68782184295a1f9c
AX-Relnotes: N/A
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2404164
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808190}