spl: move FDT_FIXUP_PARTITIONS to Kconfig

Move FDT_FIXUP_PARTITIONS to Kconfig and cleanup existing
uses.

Signed-off-by: Heiko Schocher <hs@denx.de>
diff --git a/configs/BSC9132QDS_SDCARD_DDRCLK133_defconfig b/configs/BSC9132QDS_SDCARD_DDRCLK133_defconfig
index a9555db..cc12251 100644
--- a/configs/BSC9132QDS_SDCARD_DDRCLK133_defconfig
+++ b/configs/BSC9132QDS_SDCARD_DDRCLK133_defconfig
@@ -26,3 +26,4 @@
 CONFIG_USB=y
 CONFIG_USB_STORAGE=y
 CONFIG_OF_LIBFDT=y
+CONFIG_FDT_FIXUP_PARTITIONS=y