mb/purism/librem_mini: Fix PCIe clock source mapping in devicetree
Correct PCIe clock source mapping in devicetree now that the GPIO
config has been fixed. Move ClkSrcUsage/ClkSrcClkReq registers
under their associated PCIe root ports.
Change-Id: Ibdaba51d971a39a6da6df82652b7420d7324dee5
Signed-off-by: Matt DeVillier <matt.devillier@puri.sm>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47221
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>