PCI: pci-bridge-emul: Fix PCIe bit conflicts

This patch fixes two bit conflicts in the pci-bridge-emul driver:

1. Bit 3 of Device Status (19 of Device Control) is marked as both
   Write-1-to-Clear and Read-Only. It should be Write-1-to-Clear.
   The Read-Only and Reserved bitmasks are shifted by 1 bit due to this
   error.

2. Bit 12 of Slot Control is marked as both Read-Write and Reserved.
   It should be Read-Write.

Link: https://lore.kernel.org/r/20200511162117.6674-2-jonathan.derrick@intel.comSigned-off-by: NJon Derrick <jonathan.derrick@intel.com>
Signed-off-by: NLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: NRob Herring <robh@kernel.org>

drivers/pci/pci-bridge-emul.c

@@ -185,8 +185,8 @@ static const struct pci_bridge_reg_behavior pcie_cap_regs_behavior[] = {
 		 * RO, the rest is reserved
 		 */
 		.w1c = GENMASK(19, 16),
-		.ro = GENMASK(20, 19),
-		.rsvd = GENMASK(31, 21),
+		.ro = GENMASK(21, 20),
+		.rsvd = GENMASK(31, 22),
 	},
 
 	[PCI_EXP_LNKCAP / 4] = {
@@ -226,7 +226,7 @@ static const struct pci_bridge_reg_behavior pcie_cap_regs_behavior[] = {
 			PCI_EXP_SLTSTA_CC | PCI_EXP_SLTSTA_DLLSC) << 16,
 		.ro = (PCI_EXP_SLTSTA_MRLSS | PCI_EXP_SLTSTA_PDS |
 		       PCI_EXP_SLTSTA_EIS) << 16,
-		.rsvd = GENMASK(15, 12) | (GENMASK(15, 9) << 16),
+		.rsvd = GENMASK(15, 13) | (GENMASK(15, 9) << 16),
 	},
 
 	[PCI_EXP_RTCTL / 4] = {