exynos: replace CONFIG_ENV_SPI_BASE by CONFIG_SYS_SPI_BASE

Replace CONFIG_ENV_SPI_BASE by the better CONFIG_SYS_SPI_BASE
(it is not the location for environment but the location for U-Boot)
and, as it is the only platform with use this define, remove
it from whitelist.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/arch/arm/mach-exynos/spl_boot.c b/arch/arm/mach-exynos/spl_boot.c
index b4945bd..103bb38 100644
--- a/arch/arm/mach-exynos/spl_boot.c
+++ b/arch/arm/mach-exynos/spl_boot.c
@@ -107,7 +107,7 @@
 {
 	int upto, todo;
 	int i, timeout = 100;
-	struct exynos_spi *regs = (struct exynos_spi *)CONFIG_ENV_SPI_BASE;
+	struct exynos_spi *regs = (struct exynos_spi *)CONFIG_SYS_SPI_BASE;
 
 	set_spi_clk(PERIPH_ID_SPI1, 50000000); /* set spi clock to 50Mhz */
 	/* set the spi1 GPIO */