android: use more basic CPU target for memtag

This is required for hardened_malloc to work in microdroid on MTE-enabled devices (currently, 8th
and 9th generation Pixels) since PVMFW only supports ARMv8 cores.

https://android.googlesource.com/platform/packages/modules/Virtualization/+/refs/tags/android-15.0.0_r1/pvmfw/platform.dts#100

android: use more basic CPU target for memtag

This is required for hardened_malloc to work in microdroid on MTE-enabled devices (currently, 8th
and 9th generation Pixels) since PVMFW only supports ARMv8 cores.

https://android.googlesource.com/platform/packages/modules/Virtualization/+/refs/tags/android-15.0.0_r1/pvmfw/platform.dts#100