Convert CONFIG_ENV_SPI_BUS et al to Kconfig

This converts the following to Kconfig:
   CONFIG_ENV_SPI_BUS
   CONFIG_ENV_SPI_CS
   CONFIG_ENV_SPI_MAX_HZ
   CONFIG_ENV_SPI_MODE

As part of this, we use Kconfig to provide the defaults now that were
done in include/spi_flash.h.  We also in some cases change from using
CONFIG_ENV_SPI_FOO to CONFIG_SF_DEFAULT_FOO as those were the values in
use anyhow as ENV was not enabled.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/net/pfe_eth/Kconfig b/drivers/net/pfe_eth/Kconfig
index a13b331..b2724ee 100644
--- a/drivers/net/pfe_eth/Kconfig
+++ b/drivers/net/pfe_eth/Kconfig
@@ -9,4 +9,20 @@
 	hex "PFE base address"
 	default 0x04000000
 
+config SYS_FSL_PFE_SPI_BUS
+	int "Value of SPI flash bus for PFE firmware"
+	default SF_DEFAULT_BUS
+
+config SYS_FSL_PFE_SPI_CS
+	int "Value of SPI flash chip select for PFE firmware"
+	default SF_DEFAULT_CS
+
+config SYS_FSL_PFE_SPI_MAX_HZ
+	int "Value of SPI flash max frequency for PFE firmware"
+	default SF_DEFAULT_SPEED
+
+config SYS_FSL_PFE_SPI_MODE
+	hex "Value of SPI flash work mode for PFE firmware"
+	default SF_DEFAULT_MODE
+
 endif