drm: rcar-du: lvds: Rename PLLEN bit to PLLON

The bit is named PLLON in the datasheet, rename it.

Signed-off-by: Laurent Pinchart <[e-mail]>

drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.c

···
 	/* Turn the PLL on, wait for the startup delay, and turn the output
 	 * on.
 	 */
-	lvdcr0 |= LVDCR0_PLLEN;
+	lvdcr0 |= LVDCR0_PLLON;
 	rcar_lvds_write(lvds, LVDCR0, lvdcr0);
 
 	usleep_range(100, 150);

drivers/gpu/drm/rcar-du/rcar_lvds_regs.h

···
 #define LVDCR0_DMD			(1 << 12)
 #define LVDCR0_LVMD_MASK		(0xf << 8)
 #define LVDCR0_LVMD_SHIFT		8
-#define LVDCR0_PLLEN			(1 << 4)
+#define LVDCR0_PLLON			(1 << 4)
 #define LVDCR0_BEN			(1 << 2)
 #define LVDCR0_LVEN			(1 << 1)
 #define LVDCR0_LVRES			(1 << 0)