memory: emif: Add missing kerneldoc for lpmode
Add kerneldoc for 'lpmode' struct member to fix W=1 warnings:
drivers/memory/emif.c:67 struct member 'lpmode' not described in 'emif_data'
Link: https://lore.kernel.org/r/20250525153435.15768-2-krzysztof.kozlowski@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>