mb/system76/rpl: darp9: Add SSD RTD3 configs

Some drives block the CPU from reaching C10 on suspend without the RTD3
config.

Fixes suspend with the following drives:

- Kingston KC3000 (SKC3000D/4096G)
- Kingston HyperX (SHPM2280P2H/240G)
- Solidigm P44 Pro (SSDPFKKW010X7)

The following drives continue to work:

- Samsung 970 Evo (MZVLB250HAHQ)
- WD Black SN770 (WDS250G3X0E)
- WD Green SN350 (WDS240G2G0C-00AJM0)
- WD Blue SN570 (WDS100T3B0C)

Change-Id: I205d78377fa2b0db8d37542cdb94ba86ded1d66e
Signed-off-by: Tim Crawford <tcrawford@system76.com>
Tested-by: Levi Portenier <levi@system76.com>

src/mainboard/system76/rpl/variants/darp9/overridetree.cb

@@ -16,6 +16,11 @@ chip soc/intel/alderlake
  .clk_req = 0,
  .flags = PCIE_RP_LTR | PCIE_RP_AER,
  }"
+ chip soc/intel/common/block/pcie/rtd3
+ register "reset_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_LOW(GPP_F20)" # M2_SSD2_RST#
+ register "srcclk_pin" = "0" # SSD2_CLKREQ#
+ device generic 0 on end
+ end
  end
  device ref pcie4_1 on
  # CPU RP#3 x4, Clock 4 (SSD1)
@@ -24,6 +29,11 @@ chip soc/intel/alderlake
  .clk_req = 4,
  .flags = PCIE_RP_LTR | PCIE_RP_AER,
  }"
+ chip soc/intel/common/block/pcie/rtd3
+ register "reset_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_LOW(GPP_B16)" # M2_SSD1_RST#
+ register "srcclk_pin" = "4" # SSD1_CLKREQ#
+ device generic 0 on end
+ end
  end
  device ref tbt_pcie_rp0 on end
  device ref tcss_xhci on