soc/amd/common/block/pci: Capitalize PCI ACPI names

Lowercase characters are not valid ACPI identifiers.

BUG=b:184766519
TEST=Boot picasso to OS and verify ACPI errors are no longer printed.

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I75aca67f4607e97ced8ac00ac68e51c359aff944
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54027
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-by: Jason Glenesk <jason.glenesk@gmail.com>
diff --git a/src/soc/amd/common/block/pci/pcie_gpp.c b/src/soc/amd/common/block/pci/pcie_gpp.c
index 58c7761..a3ac1cf 100644
--- a/src/soc/amd/common/block/pci/pcie_gpp.c
+++ b/src/soc/amd/common/block/pci/pcie_gpp.c
@@ -22,7 +22,7 @@
 		return NULL;
 
 	name = malloc(ACPI_NAME_BUFFER_SIZE);
-	snprintf(name, ACPI_NAME_BUFFER_SIZE, "GP%02x", dev->path.pci.devfn);
+	snprintf(name, ACPI_NAME_BUFFER_SIZE, "GP%02X", dev->path.pci.devfn);
 	name[4] = '\0';
 
 	return name;