[kernel/mips*] enable O32_FP64 support on Buster
In Jessie and Buster cycles, we finished the process from FP32 to FPXX.
And I test the whole Buster archive, and be sure that all packages are
built with FPXX now.
Since FPXX uses only even FPRs, then wastes other 16 FPRs.
And another problem of FPXX is that it may need help of RAM for some operation.
FP64 also has better co-operation with MIPS SIMD Architecture (MSA).
The CONFIG_MIPS_O32_FP64_SUPPORT has just enabled in master branch of
kernel-team/linux[2].
Is it possible to enable this config for buster? So we can start the
migration to FP64 now,
and release it with bullseye.
Otherwise we will have to start this work after bullseye released.
[1]. https://web.archive.org/web/20180828210612/https://dmz-portal.mips.com/wiki/MIPS_O32_ABI_-_FR0_and_FR1_Interlinking
[2]. https://salsa.debian.org/kernel-team/linux/commit/b1d08a0cffbe181cbb94e3fc72a91c2e8a8a38e7
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