docs/arm: Add apple HVF host for supported guest CPU type

In my test, latest QEMU already support Apple HVF for -cpu host and max.

From guest VM lscpu:

Architecture:             aarch64
  CPU op-mode(s):         64-bit
  Byte Order:             Little Endian
CPU(s):                   11
  On-line CPU(s) list:    0-10
Vendor ID:                Apple
  Model name:             -
    Model:                0
    Thread(s) per core:   1
    Core(s) per socket:   11
    Socket(s):            1
    Stepping:             0x0
    BogoMIPS:             48.00
    Flags:                fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm jscvt fcma lrcpc dcpop sha3 asimddp sha512 asim
                          dfhm dit uscat ilrcpc flagm ssbs sb paca pacg dcpodp flagm2 frint

Signed-off-by: Zhang Chen <zhangckid@gmail.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-ID: <20250401083102.72845-1-zhangckid@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

docs/system/arm/virt.rst

@@ -70,11 +70,11 @@ Supported guest CPU types:
 - ``cortex-a76`` (64-bit)
 - ``cortex-a710`` (64-bit)
 - ``a64fx`` (64-bit)
-- ``host`` (with KVM only)
+- ``host`` (with KVM and HVF only)
 - ``neoverse-n1`` (64-bit)
 - ``neoverse-v1`` (64-bit)
 - ``neoverse-n2`` (64-bit)
-- ``max`` (same as ``host`` for KVM; best possible emulation with TCG)
+- ``max`` (same as ``host`` for KVM and HVF; best possible emulation with TCG)
 
 Note that the default is ``cortex-a15``, so for an AArch64 guest you must
 specify a CPU type.