soc/amd/common: Move files to common/block

The following files need to be moved: amd_pci_util.c, amd_pci_util.h and
spi.c. The remaining files are AGESA related and will be part of a separate
issue/commit.

BUG=b:62240201
TEST=Build with no error gardenia and kahlee (no code change, just folder
reorg).

Change-Id: I3f965afa21124d4874d3b7bfe0f404a58b070e23
Signed-off-by: Richard Spiegel <richard.spiegel@silverbackltd.com>
Reviewed-on: https://review.coreboot.org/22765
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
14 files changed