config: remove kernel version restriction for ARM_PMUV3

config: remove kernel version restriction for ARM_PMUV3

The kernel CONFIG_ARM_PMUV3 option was not being presented
for 6.12 kernels with armsr/armv7.

As the minimum kernel version is now 6.6, there is no need
to limit this to specific kernel versions anymore.

This caused a kernel compile stoppage when attempting to
compile the 'perf' tool for armsr/armv7.

Signed-off-by: Mathew McBride <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/18849
Signed-off-by: Hauke Mehrtens <[email protected]>