mainboard/amd: Add padmelon board code

Padmelon board code was written for Merlin Falcon (family 15h models 60h-6fh),
but as the needed binaries are not yet merged (commit 33615), a config
HAVE_MERLINFALCON_BINARIES was added. If the binaries are not available,
the board defaults to Praririe Falcon, which use the same binaries as Stoney
Ridge. Once the binaries are merged, the config will be eliminated. Fan
control is done through F81803A SIO, and IRQ/GPIO and other board
characteristics are the same regardless of Merlin Falcon or Prairie Falcon.

Started from Gardenia code, added changes created by Marc and finally revised
against schematic, which added changes to GPIO settings.

BUG=none.
TEST=Both versions tested and boot to Linux using SeaBIOS.

Change-Id: I5a366ddeb4cfebd177a8744f6edb87aecd4787dd
Signed-off-by: Richard Spiegel <richard.spiegel@silverbackltd.com>
---
A src/mainboard/amd/padmelon/BiosCallOuts.c
A src/mainboard/amd/padmelon/BiosCallOuts.h
A src/mainboard/amd/padmelon/Kconfig
A src/mainboard/amd/padmelon/Kconfig.name
A src/mainboard/amd/padmelon/Makefile.inc
A src/mainboard/amd/padmelon/OemCustomize.c
A src/mainboard/amd/padmelon/acpi/gpe.asl
A src/mainboard/amd/padmelon/acpi/mainboard.asl
A src/mainboard/amd/padmelon/acpi/routing.asl
A src/mainboard/amd/padmelon/acpi/sleep.asl
A src/mainboard/amd/padmelon/acpi/superio.asl
A src/mainboard/amd/padmelon/acpi/usb_oc.asl
A src/mainboard/amd/padmelon/acpi_tables.c
A src/mainboard/amd/padmelon/board_info.txt
A src/mainboard/amd/padmelon/bootblock/OemCustomize.c
A src/mainboard/amd/padmelon/bootblock/bootblock.c
A src/mainboard/amd/padmelon/devicetree.cb
A src/mainboard/amd/padmelon/dsdt.asl
A src/mainboard/amd/padmelon/fan_init.c
A src/mainboard/amd/padmelon/gpio.c
A src/mainboard/amd/padmelon/gpio.h
A src/mainboard/amd/padmelon/mainboard.c
A src/mainboard/amd/padmelon/romstage.c
23 files changed, 1,613 insertions(+), 0 deletions(-)