cavium/bdk: Poke the watchdog while PCIe init

Prevent a reboot loop due to slow PCIe init.
Poke the watchdog a few times.

Change-Id: I03739d7dbad3072ccf77364fa4caba42c66ac643
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/27455
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/vendorcode/cavium/bdk/libbdk-boot/bdk-boot-pcie.c

@@ -61,6 +61,7 @@ void bdk_boot_pcie(void)
                 {
                     BDK_TRACE(INIT, "Initializing PCIe%d on Node %d\n", p, n);
                     bdk_pcie_rc_initialize(n, p);
+                    bdk_watchdog_poke();
                 }
             }
         }

src/vendorcode/cavium/bdk/libbdk-hal/bdk-pcie-cn8xxx.c

@@ -549,6 +549,7 @@ static uint32_t cfg_read32_retry(bdk_node_t node, int pcie_port, int bus, int de
             return val;
         /* Failed, wait a little and try again */
         bdk_wait_usec(10000);
+        bdk_watchdog_poke();
     } while (bdk_clock_get_count(BDK_CLOCK_TIME) < timeout);
 
     BDK_TRACE(PCIE, "N%d.PCIe%d: Config read failed, can't communicate with device\n",
@@ -1123,6 +1124,7 @@ int bdk_pcie_rc_initialize(bdk_node_t node, int pcie_port)
             return -1;
         }
         retry_count++;
+        bdk_watchdog_poke();
     }
 
     /* Errata PCIE-28816: Link retrain initiated at GEN1 can cause PCIE