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net: ipa: introduce IPA register IDs
Create a new ipa_reg_id enumerated type, which identifies each IPA
register with a symbolic identifier. Use short names, but in some
cases (such as "BCR") add "IPA_" to the name to help avoid name
conflicts.
Create two functions that indicate register validity. The first
concisely indicates whether a register is valid for a given version
of IPA, and if so, whether it is defined. The second indicates
whether a register is valid for TX or RX endpoints.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>