input: Move input.o to be built only in some cases

We only need to build and link input.o when we have any of
CONFIG_KEYBOARD, CONFIG_DM_KEYBOARD (and SPL/TPL variants) or
CONFIG_TEGRA_KEYBOARD set.
Signed-off-by: NTom Rini <trini@konsulko.com>

drivers/input/Makefile

@@ -3,15 +3,15 @@
 # (C) Copyright 2000-2007
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 
-obj-y += input.o
+obj-$(CONFIG_KEYBOARD) += input.o
 obj-$(CONFIG_$(SPL_TPL_)CROS_EC_KEYB) += cros_ec_keyb.o
 obj-$(CONFIG_$(SPL_TPL_)OF_CONTROL) += key_matrix.o
-obj-$(CONFIG_$(SPL_TPL_)DM_KEYBOARD) += keyboard-uclass.o
+obj-$(CONFIG_$(SPL_TPL_)DM_KEYBOARD) += input.o keyboard-uclass.o
 
 ifndef CONFIG_SPL_BUILD
 
 obj-$(CONFIG_I8042_KEYB) += i8042.o
-obj-$(CONFIG_TEGRA_KEYBOARD) += tegra-kbc.o
+obj-$(CONFIG_TEGRA_KEYBOARD) += input.o tegra-kbc.o
 obj-$(CONFIG_TWL4030_INPUT) += twl4030.o
 obj-$(CONFIG_TWL6030_INPUT) += twl6030.o
 endif