soc/amd/common: Introduce agesa_execute_state()

Each entrypoint to AGESA goes through the same sequence
and have same the function signature.

To avoid introducing bunch of preprocessor magic, rename
all the agesawrapper_amdXXX() functions that are actual
entrypoints to AGESA API, make them static, and provide
a single exposed entry function agesa_execute_state().

Change-Id: I96ae1874132da3843aa42c2f4e8a59ec771d3893
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31483
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/amd/stoneyridge/northbridge.c

@@ -391,7 +391,7 @@ void domain_enable_resources(struct device *dev)
 {
 	/* Must be called after PCI enumeration and resource allocation */
 	if (!romstage_handoff_is_resume())
-		do_agesawrapper(agesawrapper_amdinitmid, "amdinitmid");
+		do_agesawrapper(AMD_INIT_MID, "amdinitmid");
 }
 
 void domain_set_resources(struct device *dev)