perf: arm_v6/7_pmu: Drop non-DT probe support

perf: arm_v6/7_pmu: Drop non-DT probe support

There are no non-DT based PMU users for v6 or v7, so drop the custom
non-DT probe table. Unfortunately XScale still needs non-DT probing.

Note that this drops support for arm1156 PMU, but there are no arm1156
based systems supported in the kernel.

Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20240626-arm-pmu-3-9-icntr-v2-4-c9784b4f4065@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>