MTE tags are applied at page granularity (4K) instead of tag granularity (16)

Host environment

Operating system: Fedora 36
OS/kernel version:
```
6.0.15-200.fc36.x86_64
```
Architecture: x86
QEMU flavor: qemu-system-aarch64
QEMU version: 7.2.0

Emulated/Virtualized environment

Architecture: AArch64

Description of problem

After upgrading to QEMU v7.2.0 from v7.1.0, when executing stg/ldg instructions on any address, QEMU behaves as if the instruction was executed on the page base of said address.

I believe this was introduced in b8967ddf (@rth7680), since in that commit ptr_paddr is changed to be calculated based on CPUTLBEntryFull::phys_addr, which contains the page base address, while beforehand it was calculated based on host which does have the page offset applied.

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