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_NAND_DDRCLK100_SECURE_defconfig b/configs/BSC9132QDS_NAND_DDRCLK100_SECURE_defconfig
index e678144..5bed9aa 100644
--- a/configs/BSC9132QDS_NAND_DDRCLK100_SECURE_defconfig
+++ b/configs/BSC9132QDS_NAND_DDRCLK100_SECURE_defconfig
@@ -30,3 +30,4 @@
 CONFIG_RSA=y
 CONFIG_SPL_RSA=y
 CONFIG_OF_LIBFDT=y
+CONFIG_FDT_FIXUP_PARTITIONS=y