kselftest/arm64: Fix printf() compiler warnings in the arm64 fp tests

Lots of incorrect length modifiers, missing arguments or conversion
specifiers. Fix them.

Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Mark Brown <broonie@kernel.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20241108134920.1233992-2-catalin.marinas@arm.com


Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>