src: capitalize 'PCIe'

Change-Id: I55bbb535372dc9af556b95ba162f02ffead2b9e2
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39101
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/soc/intel/skylake/chip.h

@@ -226,7 +226,7 @@ struct soc_intel_skylake_config {
 	u8 PchDciEn;
 
 	/*
-	 * Pcie Root Port configuration:
+	 * PCIe Root Port configuration:
 	 * each element of array corresponds to
 	 * respective PCIe root port.
 	 */