hw/misc/aspeed_hace: Support to dump plaintext and digest for better debugging

hw/misc/aspeed_hace: Support to dump plaintext and digest for better debugging

1. Added "hace_hexdump()" to dump a contiguous buffer using qemu_hexdump.
2. Added "hace_iov_hexdump()" to flatten and dump scatter-gather source vectors.
3. Introduced a new trace event: "aspeed_hace_hexdump".

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250515081008.583578-17-jamin_lin@aspeedtech.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>