Convert CONFIG_SPI to Kconfig

This converts the following to Kconfig:
   CONFIG_SPI

This partly involves updating code that assumes that CONFIG_SPI implies
things that are specific to the MPC8xx SPI driver.  For now, just update
the CONFIG tests.  This also involves reworking the default for
CONFIG_SYS_DEF_EEPROM_ADDR so that we don't set it when we cannot make a
reasonable default, as it does not cause any compile failures.

Signed-off-by: Adam Ford <aford173@gmail.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index c930fa2..6f06f2c 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -379,6 +379,7 @@
 	select DM_SERIAL
 	select DM_SPI
 	select DM_SPI_FLASH
+	select SPI
 
 config TARGET_DEVKIT3250
 	bool "Support devkit3250"
@@ -434,6 +435,7 @@
 	select DM_SERIAL
 	select DM_SPI
 	select DM_SPI_FLASH
+	select SPI
 	select SPI_FLASH
 	select PL01X_SERIAL
 
@@ -540,6 +542,7 @@
 	select DM_SPI
 	select DM_GPIO
 	select DM_KEYBOARD
+	select SPI
 	imply FAT_WRITE
 
 config ARCH_S5PC1XX
@@ -760,6 +763,7 @@
 	select CLK
 	select SPL_CLK if SPL
 	select CLK_ZYNQ
+	select SPI
 	imply CMD_CLK
 	imply FAT_WRITE
 	imply CMD_SPL
@@ -1177,6 +1181,7 @@
 	select DM_PWM
 	select DM_REGULATOR
 	select ENABLE_ARM_SOC_BOOT0_HOOK
+	select SPI
 	imply CMD_FASTBOOT
 	imply FASTBOOT
 	imply FAT_WRITE