memory: pl353-smc: Fix style

Use proper spacing.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20210610082040.2075611-11-miquel.raynal@bootlin.comSigned-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>