Turn CONFIG_DEVMEM back off for aarch64

We have ended up with a config mismatch for the RHEL configs in a way that was unclear and untracked. CONFIG_STRICT_DEVMEM is enabled in configs/common/generic, but CONFIG_DEVMEM was disabled for aarch64 in RHEL (though not in Fedora). This creates a mismatch situation where the configs do not get generated in the way they are set. Our options are to either turn off CONFIG_STRICT_DEVMEM as I have here, or turn on CONFIG_DEVMEM for aarch64. I went with the former after discussion in the MR.

Signed-off-by: Justin M. Forbes jforbes@fedoraproject.org