esp: macro cleanup, and fix some data type sizes.

[philljj]

Description

• esp macro cleanup (wrap parentheses, remove unused parm).
• widen enc_len to uint32_t since its input is ultimately from uint32_t frame_len.

Fixes: F-327, F-328, F-333.

[Copilot]

Pull request overview

This PR cleans up internal ESP helper macros and fixes length-related type sizing in the ESP encryption/decryption routines, aligning length calculations with the uint32_t frame lengths used throughout the ESP unwrap/wrap flow.

Changes:

• Wrap ESP length/pointer macros in full parentheses to avoid precedence surprises in macro expansions.
• Remove the unused iv_len parameter from esp_enc_iv() and update all local call sites.
• Widen enc_len (and RFC4543 aad_len) from uint16_t to uint32_t to prevent truncation for larger ESP payloads.

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