Rename LMB_LIMIT_DMA_BELOW_4G to LMB_LIMIT_DMA_BELOW_RAM_TOP to make the Kconfig option more descriptive. No functional change. Suggested-by: Ilias Apalodimas <ilias.apalodimas@linaro.org> Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org> Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>