bf609: convert vs6624 blank_clocks to black_pixels

PPI driver has changed blank units from clocks to pixels.

Signed-off-by: Scott Jiang <scott.jiang.linux@gmail.com>
Signed-off-by: Bob Liu <lliubbo@gmail.com>
diff --git a/arch/blackfin/mach-bf609/boards/ezkit.c b/arch/blackfin/mach-bf609/boards/ezkit.c
index f664176..a4ef400 100644
--- a/arch/blackfin/mach-bf609/boards/ezkit.c
+++ b/arch/blackfin/mach-bf609/boards/ezkit.c
@@ -878,7 +878,7 @@
 	.ppi_info = &ppi_info,
 	.ppi_control = (PACK_EN | DLEN_8 | EPPI_CTL_FS1HI_FS2HI
 			| EPPI_CTL_POLC3 | EPPI_CTL_SYNC2 | EPPI_CTL_NON656),
-	.blank_clocks = 8,
+	.blank_pixels = 4,
 };
 #endif