ENGR00160621 [MX6]Workaround for reset issue

Add workaround for POR/wdog reset issue, we need to
do a CORE LDO reset everytime POR/wdog reset, otherwise
kernel will crash or hang when we booting more than 2
cores. Root cause is still under investigation, it is
analog/power related issue, may take long time to
identify the root cause, we need to add workaround to make
function ready first. The flow of workaround is as below:

1. Check CORE LDO reset flag, currently stored in SNVS_LPGPR[0];
2. If it is there, clear it, go on boot up system; If not,
Set the flag, configure wdog to timeout in 0.5 seconds, then
disable CORE LDO and wait for wdog timeout;

This workaround will bring 0.5~1 seconds delay of booting.

Signed-off-by: Anson Huang <b20788@freescale.com>

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