video: lcd: Add CONFIG_SPLASH_SCREEN_PREPARE support to CONFIG_VIDEO

Create splash.c/h to put the function and any future common splash
screen code in.

Signed-off-by: Robert Winkler <robert.winkler@boundarydevices.com>
Acked-by: Igor Grinberg <grinberg@compulab.co.il>
diff --git a/common/Makefile b/common/Makefile
index 48791b7..53c92ef 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -196,6 +196,7 @@
 COBJS-$(CONFIG_CMD_KGDB) += kgdb.o kgdb_stubs.o
 COBJS-$(CONFIG_I2C_EDID) += edid.o
 COBJS-$(CONFIG_KALLSYMS) += kallsyms.o
+COBJS-y += splash.o
 COBJS-$(CONFIG_LCD) += lcd.o
 COBJS-$(CONFIG_LYNXKDI) += lynxkdi.o
 COBJS-$(CONFIG_MENU) += menu.o