RAS/AMD/ATL: Expand helpers for adding and removing base and hole

The ret_addr field in struct addr_ctx contains the intermediate value of
the returned address as it passes through multiple steps in the
translation process. Currently, adding the DRAM base and legacy hole
is only done once, so it operates directly on the intermediate value.

However, for DF 4.5 non-power-of-2 denormalization, adding and removing
the DRAM base and legacy hole needs to be done for multiple temporary
address values. During this process, the intermediate value should not be
lost so the ret_addr value can't be reused.

Update the existing 'add' helper to operate on an arbitrary address
and introduce a new 'remove' helper to do the inverse operations.

Signed-off-by: John Allen <[email protected]>
Signed-off-by: Borislav Petkov (AMD) <[email protected]>
Reviewed-by: Yazen Ghannam <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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