lib: os: cbprintf_packaged: update alignment for x86-32
lib: os: cbprintf_packaged: update alignment for x86-32

The size of long double on x86-32 is 12 which is not
a power of 2, and this results in build error when it is
being used for alignment of buf32 in log_core.c.
So manually set it to 16.

Signed-off-by: Daniel Leung <d94e04d205b5962d7873a139ef298b03c1717f72@intel.com>

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