gpio: introduce CONFIG_SPL_DM_PCA953X

Introduce CONFIG_SPL_DM_PCA953X for SPL usage.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 7c479ef..3be3250 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -9,7 +9,7 @@
 endif
 obj-$(CONFIG_DM_GPIO)		+= gpio-uclass.o
 
-obj-$(CONFIG_DM_PCA953X)	+= pca953x_gpio.o
+obj-$(CONFIG_$(SPL_)DM_PCA953X)	+= pca953x_gpio.o
 obj-$(CONFIG_DM_74X164)		+= 74x164_gpio.o
 
 obj-$(CONFIG_AT91_GPIO)	+= at91_gpio.o