ENGR00174841 [U-Boot]Add a command to erase any pre-saved environment

A "destroyenv" command is provided to erase any pre-save environment in the
boot storage. The command simply add 1 to the CRC section and write it back
to the storage. Per the logic of U-Boot, this means after a reset, the
software will recognize the stored environment settings as "damaged" and turn
to use the default one, which is defined in "default_environment"

With this command, platform bring up owner can maintain a "ready-to-use"
environment settings in software which others can use very conviniently.
U-boot users can also use it to do a environment restore if they want.

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Usage Example:
> destroyenv

invalidate the CRC
write invalidate enviroment data to storage
Erasing SPI flash...Erasing SPI NOR flash 0xc0000 [0x2000 bytes]
..SUCCESS

Writing to SPI flash...Writing SPI NOR flash
0xc0000 [0x2000 bytes] <- ram 0x276009b8
SUCCESS

done
>
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Signed-off-by: Eric Sun <jian.sun@freescale.com>

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