soc/amd/common: Move AGESA related source files

Move AGESA related source files in soc/amd/common under block directory.
Folder soc/amd/common/block subfolders should mimic soc/intel/common/block
subfolders (one subfolder per subject).

BUG=b:69262110
TEST=Build with no error gardenia and kahlee (no code change, just folder
reorg).

Change-Id: I497cdefe64e8dff00aaff7153c4ffa9c57c9acf8
Signed-off-by: Richard Spiegel <richard.spiegel@silverbackltd.com>
Reviewed-on: https://review.coreboot.org/22792
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
8 files changed