soc/rockchip: Drop unneeded empty lines

Change-Id: I6932580a373608d3d2fa5d844efdc7ffbc577d1f
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44601
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>

src/soc/rockchip/rk3399/sdram.c

@@ -434,7 +434,6 @@ static void phy_io_config(u32 channel,
 	/* PHY_939 PHY_PAD_CS_DRIVE */
 	clrsetbits32(&denali_phy[939], 0x7 << 14, mode_sel << 14);
 
-
 	/* speed setting */
 	if (sdram_params->ddr_freq < 400 * MHz)
 		speed = 0x0;