Reduce skiroot kernel size by 200k by disabling unused config options

By disabling some unused compression options, we shave roughly 200k off
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-rwxr-xr-x 1 stewart users 14796336 May 28 10:37 zImage.epapr
-rwxr-xr-x 1 stewart users 14581928 Jun 12 08:24 zImage.epapr

Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
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