Blackfin: add a GPIO_DEFAULT_BOOT_SPI_CS

This is parallel to the existing P_DEFAULT_BOOT_SPI_CS, but in terms of
the GPIO value so it can be used with the normal gpio API.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/arch/blackfin/mach-bf548/include/mach/portmux.h b/arch/blackfin/mach-bf548/include/mach/portmux.h
index 89ad6a8..89f282d 100644
--- a/arch/blackfin/mach-bf548/include/mach/portmux.h
+++ b/arch/blackfin/mach-bf548/include/mach/portmux.h
@@ -131,6 +131,7 @@
 #define P_KEY_COL2	(P_DEFINED | P_IDENT(GPIO_PD14) | P_FUNCT(3))
 #define P_KEY_COL3	(P_DEFINED | P_IDENT(GPIO_PD15) | P_FUNCT(3))
 
+#define GPIO_DEFAULT_BOOT_SPI_CS GPIO_PE4
 #define P_DEFAULT_BOOT_SPI_CS P_SPI0_SSEL1
 #define P_SPI0_SCK	(P_DEFINED | P_IDENT(GPIO_PE0) | P_FUNCT(0))
 #define P_SPI0_MISO	(P_DEFINED | P_IDENT(GPIO_PE1) | P_FUNCT(0))