mb/google/rex: Simplify power limit configuration usage

This patch removes the deprecated PL_PERFORMANCE and PL_BASELINE
configurations, relying instead on the refactored power limit flow.

This flow allows for seamless overrides by the baseboard and/or by
the variant board, if necessary.

Specifically, this patch:

- Removes PL_PERFORMANCE and PL_BASELINE configuration options from
  mainboard.c in the google/rex directory.
- Relies on the baseboard_devtree_update() function, which is
  implemented by the respective baseboard, to handle power limit
  configuration.
- Leverages the variant_devtree_update() function, which is a
  __weak implementation, to allow overrides by the variant directory.

This simplification improves code readability and maintainability while
maintaining the flexibility to handle power limit configurations as
needed.

Change-Id: I872e5cb59d7b2789ef517d4a090189785db46b85
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79331
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

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