hw/arm/aspeed: Rename and export connect_serial_hds_to_uarts() as aspeed_connect_seri...

hw/arm/aspeed: Rename and export connect_serial_hds_to_uarts() as aspeed_connect_serial_hds_to_uarts()

The helper function connect_serial_hds_to_uarts() has been renamed to
aspeed_connect_serial_hds_to_uarts() and promoted to a public Aspeed
machine API.

Previously, this function was declared static within aspeed.c and only
used internally. Renaming it with the aspeed_ prefix and exporting its
declaration in aspeed.h makes the function accessible to other Aspeed
machine implementations that need to attach host serial devices to SoC
UARTs.

No functional changes.

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20251104031325.146374-30-jamin_lin@aspeedtech.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>