mainboard/amd: Add padmelon board code

Padmelon board is compatible with Merlin Falcon (family 15h models 60h-6fh)
and Prairie Falcon (family 15h models 70h-7fh). This code is the release for
the system using Prairie Falcon, a new release for Merlin Falcon will be made
when Merlin Falcon binaries are merged (commit 33615). Fan control is done
through F81803A SIO, and IRQ/GPIO and other board characteristics are the same
regardless of Merlin Falcon or Prairie Falcon.

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/irq_tables.c
A src/mainboard/amd/padmelon/mainboard.c
A src/mainboard/amd/padmelon/mptable.c
A src/mainboard/amd/padmelon/romstage.c
25 files changed, 1,869 insertions(+), 0 deletions(-)