[OE-core] Re:kernel.bbclass, module-base.bbclass: Use CC to form KERNEL_CC

[Anton Sergienko]

Hi!
After the patch (commit c49f967384ccbfe131bbb33ee518014f3fc4b38f) to
meta/classes/kernel-arch.bbclass kernel build fails for arm machine with
hard floating point instruction set in CC (-mfloat-abi=hard).
As I understand kernel should not be build with fpu specific floating point
instructions(should not be any floating point operation at all), but CFLAGS
from machine-tune are propagated to CC and it also include -mfloat-abi
flag. Should not -mfloat-abi flag be filtered out in kernel-arch.bbclass ?

//Anton
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