Rename AMD_AGESA to CPU_AMD_AGESA

Also any CPU_AMD_AGESA_FAMILYxx selects CPU_AMD_AGESA, so remove
the explicit selects from the mainboards.

Change-Id: I4d71726bccd446b0f4db4e26448b5c91e406a641
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/792
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>

src/arch/x86/init/bootblock.ld

@@ -51,5 +51,5 @@ SECTIONS
 		*(.eh_frame);
 	}
 
-	_bogus = ASSERT((SIZEOF(.bss) + SIZEOF(.data)) == 0 || CONFIG_AMD_AGESA, "Do not use global variables in romstage");
+	_bogus = ASSERT((SIZEOF(.bss) + SIZEOF(.data)) == 0 || CONFIG_CPU_AMD_AGESA, "Do not use global variables in romstage");
 }