mb/prodrive/atlas: Disable ASPM for i225 port

I225 doesn’t support ASPM, so disable it at the root port.

Signed-off-by: Lean Sheng Tan <sheng.tan@9elements.com>
Change-Id: I61fe3760c1cde60795c9b52c703e521ba4df504a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63466
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/mainboard/prodrive/atlas/devicetree.cb

@@ -60,6 +60,7 @@ chip soc/intel/alderlake
 	}"
 	register "pch_pcie_rp[PCH_RP(10)]" = "{
 		.flags = PCIE_RP_CLK_SRC_UNUSED,
+		.pcie_rp_aspm = ASPM_DISABLE,
 	}"
 	register "pcie_clk_config_flag[0]" = "PCIE_CLK_FREE_RUNNING"
 	register "pcie_clk_config_flag[1]" = "PCIE_CLK_FREE_RUNNING"