ASPEED soc driver updates for 5.11

New drivers:

 - SoC info driver to expose revision information

New features:

 - AST2600 support for the LPC control driver. This includes
   setting the LPC2AHB bridge up in a backwards compatible manner.

Cleanups:

 - LPC control
 - Kconfig
 - Bindings updates for AST2600 strings

soc: aspeed: Enable drivers with ARCH_ASPEED

Default the drivers to on as most configurations will use them.

Signed-off-by: Joel Stanley <joel@jms.id.au>