drivers/genesyslogic/gl9755: Add driver for Genesys Logic GL9755

The device is a PCIe Gen2 to SD 4.0 card reader controller to be
used in the Chromebook. The datasheet name is GL9755S and the revision
is 05.

The patch sets LTR value.

Signed-off-by: Ben Chuang <benchuanggli@gmail.com>
Change-Id: I16048dde348be248c748d50ca4a8a62c8a781430
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45062
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
diff --git a/src/include/device/pci_ids.h b/src/include/device/pci_ids.h
index 944c20e..83cf25e 100644
--- a/src/include/device/pci_ids.h
+++ b/src/include/device/pci_ids.h
@@ -2033,6 +2033,7 @@
 
 #define PCI_VENDOR_ID_GLI		0x17a0
 #define PCI_DEVICE_ID_GLI_9763E		0xe763
+#define PCI_DEVICE_ID_GLI_9755		0x9755
 
 #define PCI_VENDOR_ID_XGI		0x18ca
 #define PCI_DEVICE_ID_XGI_20		0x0020