arm64: v8.4: Support for new floating point multiplication instructions

ARM v8.4 extensions add new neon instructions for performing a
multiplication of each FP16 element of one vector with the corresponding
FP16 element of a second vector, and to add or subtract this without an
intermediate rounding to the corresponding FP32 element in a third vector.

This patch detects this feature and let the userspace know about it via a
HWCAP bit and MRS emulation.

Cc: Dave Martin <[email protected]>
Reviewed-by: Suzuki K Poulose <[email protected]>
Signed-off-by: Dongjiu Geng <[email protected]>
Reviewed-by: Dave Martin <[email protected]>
Signed-off-by: Catalin Marinas <[email protected]>

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