Makefile: Rename ALL-y to INPUTS-y

When binman is in use, most of the targets built by the Makefile are
inputs to binman. We then need a final rule to run binman to produce the
final outputs.

Rename the variable to indicate this, and add a new 'inputs' target.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/arm/config.mk b/arch/arm/config.mk
index f256031..4153f7e 100644
--- a/arch/arm/config.mk
+++ b/arch/arm/config.mk
@@ -122,7 +122,7 @@
 
 ifneq ($(CONFIG_SPL_BUILD),y)
 # Check that only R_ARM_RELATIVE relocations are generated.
-ALL-y += checkarmreloc
+INPUTS-y += checkarmreloc
 # The movt / movw can hardcode 16 bit parts of the addresses in the
 # instruction. Relocation is not supported for that case, so disable
 # such usage by requiring word relocations.
@@ -154,17 +154,17 @@
 ifneq ($(CONFIG_IMX_CONFIG),)
 ifdef CONFIG_SPL
 ifndef CONFIG_SPL_BUILD
-ALL-y += SPL
+INPUTS-y += SPL
 endif
 else
 ifeq ($(CONFIG_OF_SEPARATE),y)
-ALL-y += u-boot-dtb.imx
+INPUTS-y += u-boot-dtb.imx
 else
-ALL-y += u-boot.imx
+INPUTS-y += u-boot.imx
 endif
 endif
 ifneq ($(CONFIG_VF610),)
-ALL-y += u-boot.vyb
+INPUTS-y += u-boot.vyb
 endif
 endif