common: Compile error with CONFIG_MULTI_DTB_FIT and not SPL

common/common_fit.c is including <spl.h>, but not actually using it. The
inclusion will cuase compile error on platforms using CONFIG_OF_SEPARATE
and not SPL.

Signed-off-by: Lars Povlsen <lars.povlsen@microsemi.com>
Reviewed-by: Jean-Jacques Hiblot <jjhiblot@ti.com>

common/common_fit.c

@@ -8,7 +8,6 @@
 #include <errno.h>
 #include <image.h>
 #include <linux/libfdt.h>
-#include <spl.h>
 
 ulong fdt_getprop_u32(const void *fdt, int node, const char *prop)
 {