Makefile: don't try to construct CLEAN_FILES based on config

All of the clean targets (clean, dist-clean, mrproper) are run without
loading a configuration. That means that any conditional modification of
CLEAN_FILES will either always apply or never apply and so shouldn't be
in a conditional in the first place.

Since CLEAN_FILES is allowed to list nonexistent files, just add
everything to it unconditionally to fix the issue.

Signed-off-by: Thomas Hebb <tommyhebb@gmail.com>

Makefile

@@ -1306,7 +1306,6 @@ MKIMAGEFLAGS_u-boot-ivt.img = -A $(ARCH) -T firmware_ivt -C none -O u-boot \
 	-a $(CONFIG_SYS_TEXT_BASE) -e $(CONFIG_SYS_UBOOT_START) \
 	-n "U-Boot $(UBOOTRELEASE) for $(BOARD) board"
 u-boot-ivt.img: MKIMAGEOUTPUT = u-boot-ivt.img.log
-CLEAN_FILES += u-boot-ivt.img.log u-boot-dtb.imx.log SPL.log u-boot.imx.log
 endif
 
 MKIMAGEFLAGS_u-boot-dtb.img = $(MKIMAGEFLAGS_u-boot.img)
@@ -1406,7 +1405,6 @@ lpc32xx-boot-1.bin: lpc32xx-spl.img FORCE
 lpc32xx-full.bin: lpc32xx-boot-0.bin lpc32xx-boot-1.bin u-boot.img FORCE
 	$(call if_changed,cat)
 
-CLEAN_FILES += lpc32xx-*
 endif
 
 OBJCOPYFLAGS_u-boot-with-tpl.bin = -I binary -O binary \
@@ -1931,7 +1929,9 @@ CLEAN_DIRS  += $(MODVERDIR) \
 			$(filter-out include, $(shell ls -1 $d 2>/dev/null))))
 
 CLEAN_FILES += include/bmp_logo.h include/bmp_logo_data.h tools/version.h \
-	       boot* u-boot* MLO* SPL System.map fit-dtb.blob*
+	       boot* u-boot* MLO* SPL System.map fit-dtb.blob* \
+	       u-boot-ivt.img.log u-boot-dtb.imx.log SPL.log u-boot.imx.log \
+	       lpc32xx-*
 
 # Directories & files removed with 'make mrproper'
 MRPROPER_DIRS  += include/config include/generated spl tpl \