Blackfin arch: move hard coded pin_req to board file

Remove some sort of bloaty code, try to get these pin_req arrays built at compile-time

 - move this static things to the blackfin board file
 - add pin_req array to struct bfin5xx_spi_master
 - tested on BF537/BF548 with SPI flash

Signed-off-by: Bryan Wu <bryan.wu@analog.com>

diff --git a/arch/blackfin/mach-bf527/boards/ezkit.c b/arch/blackfin/mach-bf527/boards/ezkit.c
index bf1bedc..88b41b7 100644
--- a/arch/blackfin/mach-bf527/boards/ezkit.c
+++ b/arch/blackfin/mach-bf527/boards/ezkit.c
@@ -46,6 +46,7 @@
 #include <asm/bfin5xx_spi.h>
 #include <asm/reboot.h>
 #include <asm/nand.h>
+#include <asm/portmux.h>
 #include <linux/spi/ad7877.h>
 
 /*
@@ -562,6 +563,7 @@
 static struct bfin5xx_spi_master bfin_spi0_info = {
 	.num_chipselect = 8,
 	.enable_dma = 1,  /* master has the ability to do dma transfer */
+	.pin_req = {P_SPI0_SCK, P_SPI0_MISO, P_SPI0_MOSI, 0},
 };
 
 /* SPI (0) */