Since we have many software running on QM/QXP, it is better to print their
commit ids in u-boot to know their versions.

This patch enables the CONFIG_ARCH_MISC_INIT. In arch_misc_init to gets the
commit ids for SCFW and ATF via their APIs and get the commit for imx-mkimage
at the end of u-boot.bin loading address.

Once the commit ids are acquired, show them in console like:
    BuildInfo: SCFW 45c567e8, IMX-MKIMAGE cc994971, ATF 0a9efa7

and set them to environment variables like:
    commit_atf=0a9efa7
    commit_mkimage=cc994971
    commit_scfw=45c567e8

If old software are running which does not support provide commit it, the patch
use 0 instead.

Signed-off-by: Ye Li <ye.li@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>