board: ast2600-dcscm: Add Aspeed AST2600 DCSCM demo board support

ast2600-dcscm is a new demo board with DCSCM form factor.
- Toggle GPIOC1 for phy reset

For Intel Avenue City support, the followin

board: ast2600-dcscm: Add Aspeed AST2600 DCSCM demo board support

ast2600-dcscm is a new demo board with DCSCM form factor.
- Toggle GPIOC1 for phy reset

For Intel Avenue City support, the following are enabled:
- ACPI
- BIOS post code passthrough sgpio port A.

Signed-off-by: Troy Lee <troy_lee@aspeedtech.com>
Change-Id: Iadc202ef25af3548a6c8f4c714ef3e9ef0da69d4

show more ...