MLK-13450-6 mx7ulp: Add soc level initialization codes and functions

Implement soc level functions to get cpu rev, reset cause, enable cache,
etc. We will disable the wdog and init clocks in s_init at very early u-boot
phase.

Since the we are seeking the way to get chip id for mx7ulp, the get_cpu_rev
is hard coded to a fixed value. This may change in future.

Signed-off-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Shenwei Wang <shenwei.wang@nxp.com>

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