Add patch to fix broken PCIe with u-boot

u-boot fails to fixup the PCIe nodes on the rev1 LX2160A due to the
code not testing for the correct ID.  Add the correct ID.
Signed-off-by: Russell King <rmk@armlinux.org.uk>

patches/u-boot-LSDK-20.04/0020-pci-fix-layerscape.patch

+From 04f824bd1210fbc6db08560dda9cd14318f859d9 Mon Sep 17 00:00:00 2001
+From: Russell King <rmk@armlinux.org.uk>
+Date: Tue, 5 May 2020 01:01:01 +0300
+Subject: [PATCH] pci: fix layerscape
+
+On the LX2160A rev 1, SVR_SOC_VER() returns 0x873610, and this causes
+the wrong PCIe fdt fixup code to be called, resulting in all PCIe
+devices remaining disabled in the DT passed to the kernel.  Fix this
+by detecting the ID and using the correct gen4 layerscape PCIe code.
+
+Signed-off-by: Russell King <rmk@armlinux.org.uk>
+---
+ drivers/pci/pcie_layerscape_fixup_common.c | 5 +++--
+ 1 files changed, 3 insertions(+), 2 deletions(-)
+
+diff --git a/drivers/pci/pcie_layerscape_fixup_common.c b/drivers/pci/pcie_layerscape_fixup_common.c
+index b6179798b3..0327930ddb 100644
+--- a/drivers/pci/pcie_layerscape_fixup_common.c
++++ b/drivers/pci/pcie_layerscape_fixup_common.c
+@@ -18,8 +18,9 @@ void ft_pci_setup(void *blob, bd_t *bd)
+ 	uint svr;
+ 
+ 	svr = SVR_SOC_VER(get_svr());
+-
+-	if (svr == SVR_LX2160A && IS_SVR_REV(get_svr(), 1, 0))
++	/* Rev 1 LX2160A have svr = 0x873610 */
++	if ((svr == SVR_LX2160A || svr == (SVR_LX2160A | 0x10)) &&
++	    IS_SVR_REV(get_svr(), 1, 0))
+ 		ft_pci_setup_ls_gen4(blob, bd);
+ 	else
+ #endif /* CONFIG_PCIE_LAYERSCAPE_GEN4 */