memory: renesas-rpc-if: avoid use of undocumented bits

Instead of writing fixed values with undocumented bits which happen to
be set on some SoCs, better switch to read-modify-write operations
changing only bits which are documented. This is way more future-proof
as we don't know yet how these bits may be on upcoming SoCs.

Signed-off-by: Wolfram Sang <[email protected]>
Tested-by: Lad Prabhakar <[email protected]>
Reviewed-by: Lad Prabhakar <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Krzysztof Kozlowski <[email protected]>

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