MIPS: ELF: Set FP mode according to .MIPS.abiflags

MIPS: ELF: Set FP mode according to .MIPS.abiflags

This patch reads the .MIPS.abiflags section when it is present, and sets
the FP mode of the task accordingly. Any loaded ELF files which do not
contain a .MIPS.abiflags section will continue to observe the previous
behaviour, that is FR=1 if EF_MIPS_FP64 is set else FR=0.

Signed-off-by: Paul Burton <[email protected]>
Cc: [email protected]
Cc: Alexander Viro <[email protected]>
Cc: [email protected]
Cc: [email protected]
Patchwork: https://patchwork.linux-mips.org/patch/7681/
Signed-off-by: Ralf Baechle <[email protected]>