MIPS: ELF: Drop `get_fp_abi'

Commit 46490b57

 [MIPS: kernel: elf: Improve the overall ABI and FPU mode
checks] reduced `get_fp_abi' to an elaborate pass-through.  Drop it
then.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9677/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>