hw/arm/aspeed_ast10x0: Pass SoC name to common init for AST10x0 family reuse

Refactor the AST10x0 common initialization to accept a socname
parameter.

The AST1030 model can be reused by AST1060 since they share most of the
same controllers. This approach allows AST1060 to leverage the existing
AST1030 initialization flow while keeping separate SoC-specific init
functions for components that differ.

This prepares the framework for AST1060 support, allowing it to reuse
AST1030 device models and initialization flow without code duplication.

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/20251112030553.291734-8-jamin_lin@aspeedtech.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>