uboot-imx

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>