Rename CONFIG_SYS_TEXT_BASE to CONFIG_TEXT_BASE

The current name is inconsistent with SPL which uses CONFIG_SPL_TEXT_BASE
and this makes it imposible to use CONFIG_VAL().

Rename it to resolve this problem.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-sunxi/spl_spi_sunxi.c b/arch/arm/mach-sunxi/spl_spi_sunxi.c
index 520f14e..81159cf 100644
--- a/arch/arm/mach-sunxi/spl_spi_sunxi.c
+++ b/arch/arm/mach-sunxi/spl_spi_sunxi.c
@@ -341,7 +341,7 @@
 	struct legacy_img_hdr *header;
 	uint32_t load_offset = sunxi_get_spl_size();
 
-	header = (struct legacy_img_hdr *)CONFIG_SYS_TEXT_BASE;
+	header = (struct legacy_img_hdr *)CONFIG_TEXT_BASE;
 	load_offset = max_t(uint32_t, load_offset, CONFIG_SYS_SPI_U_BOOT_OFFS);
 
 	spi0_init();