imx6: clock: correct comment for PLL_VIDEO

This appear to be a copy-paste error, clean it up.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Reviewed-by: Stefano Babic <sbabic@denx.de>

arch/arm/mach-imx/mx6/clock.c

@@ -19,7 +19,7 @@ enum pll_clocks {
 	PLL_USBOTG,	/* OTG USB PLL */
 	PLL_ENET,	/* ENET PLL */
 	PLL_AUDIO,	/* AUDIO PLL */
-	PLL_VIDEO,	/* AUDIO PLL */
+	PLL_VIDEO,	/* VIDEO PLL */
 };
 
 struct mxc_ccm_reg *imx_ccm = (struct mxc_ccm_reg *)CCM_BASE_ADDR;