PCI: tegra194: Create debugfs directory only when CONFIG_PCIEASPM is enabled

Previously, the debugfs directory was unconditionally created in
tegra_pcie_config_rp() regardless of the CONFIG_PCIEASPM setting.
This led to unnecessary directory creation when ASPM support was disabled
since only ASPM state count was exposed through debugfs.

Hence, move the debugfs directory creation into init_debugfs() which is
conditionally compiled based on CONFIG_PCIEASPM. This ensures that both
the directory and 'aspm_state_cnt' entry are only created when ASPM is
enabled and avoids cluttering debugfs with empty directories when ASPM is
disabled.

Signed-off-by: Hans Zhang <[email protected]>
[mani: subject and description change]
Signed-off-by: Manivannan Sadhasivam <[email protected]>
Reviewed-by: Christophe JAILLET <[email protected]>
Link: https://patch.msgid.link/[email protected]

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