Dual mode DesignWare PCIe IP has PTM capability enabled (if supported) even
in the EP mode. The PCIe compliance for the EP mode expects PTM
capabilities (ROOT_CAPABLE, RES_CAPABLE, CLK_GRAN) be disabled.
Hence disable PTM for the EP mode.

Link: https://lore.kernel.org/r/20220919143340.4527-3-vidyas@nvidia.comSigned-off-by: NVidya Sagar <vidyas@nvidia.com>
Signed-off-by: NLorenzo Pieralisi <lpieralisi@kernel.org>
Acked-by: NJingoo Han <jingoohan1@gmail.com>