of: clean up OF_CONTROL ifdef conditionals

We have flipped CONFIG_SPL_DISABLE_OF_CONTROL.  We have cleansing
devices, $(SPL_) and CONFIG_IS_ENABLED(), so we are ready to clear
away the ugly logic in include/fdtdec.h:

 #ifdef CONFIG_OF_CONTROL
 # if defined(CONFIG_SPL_BUILD) && !defined(SPL_OF_CONTROL)
 #  define OF_CONTROL 0
 # else
 #  define OF_CONTROL 1
 # endif
 #else
 # define OF_CONTROL 0
 #endif

Now CONFIG_IS_ENABLED(OF_CONTROL) is the substitute.  It refers to
CONFIG_OF_CONTROL for U-boot proper and CONFIG_SPL_OF_CONTROL for
SPL.

Also, we no longer have to cancel CONFIG_OF_CONTROL in
include/config_uncmd_spl.h and scripts/Makefile.spl.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/lib/Makefile b/lib/Makefile
index 3b6a74b..96f832e 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -26,8 +26,8 @@
 obj-y += crc16.o
 obj-$(CONFIG_ERRNO_STR) += errno_str.o
 obj-$(CONFIG_FIT) += fdtdec_common.o
-obj-$(CONFIG_OF_CONTROL) += fdtdec_common.o
-obj-$(CONFIG_OF_CONTROL) += fdtdec.o
+obj-$(CONFIG_$(SPL_)OF_CONTROL) += fdtdec_common.o
+obj-$(CONFIG_$(SPL_)OF_CONTROL) += fdtdec.o
 obj-$(CONFIG_TEST_FDTDEC) += fdtdec_test.o
 obj-$(CONFIG_GZIP) += gunzip.o
 obj-$(CONFIG_GZIP_COMPRESSED) += gzip.o
@@ -51,15 +51,12 @@
 
 ifndef CONFIG_SPL_BUILD
 obj-$(CONFIG_OF_LIBFDT) += libfdt/
-obj-$(CONFIG_OF_CONTROL) += fdtdec_common.o
-obj-$(CONFIG_OF_CONTROL) += fdtdec.o
 endif
-
 ifdef CONFIG_SPL_OF_CONTROL
 obj-$(CONFIG_OF_LIBFDT) += libfdt/
-obj-$(CONFIG_OF_CONTROL) += fdtdec_common.o
-obj-$(CONFIG_OF_CONTROL) += fdtdec.o
 endif
+obj-$(CONFIG_$(SPL_)OF_CONTROL) += fdtdec_common.o
+obj-$(CONFIG_$(SPL_)OF_CONTROL) += fdtdec.o
 
 ifdef CONFIG_SPL_BUILD
 obj-$(CONFIG_SPL_YMODEM_SUPPORT) += crc16.o