pcidev: Move scandev_inclass logic from internal to pcidev

Tested: ```sudo ./flashrom -p internal -r /tmp/bios
<snip>
Found Programmer flash chip "Opaque flash chip" (16384 kB, Programmer-specific) mapped at physical address 0x0000000000000000.
Reading flash... done.
```

Change-Id: I1978e178fb73485f1c5c7e732853522847267cee
Signed-off-by: Edward O'Callaghan <quasisec@google.com>
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/59277
Original-Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/72302
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/pcidev.c b/pcidev.c
index a20d24b..3515871 100644
--- a/pcidev.c
+++ b/pcidev.c
@@ -160,6 +160,25 @@
 	return NULL;
 }
 
+struct pci_dev *pcidev_find_vendorclass(uint16_t vendor, uint16_t devclass)
+{
+	struct pci_dev *temp = NULL;
+	struct pci_filter filter;
+	uint16_t tmp2;
+
+	pci_filter_init(NULL, &filter);
+	filter.vendor = vendor;
+
+	while ((temp = pcidev_scandev(&filter, temp))) {
+		/* Read PCI class */
+		tmp2 = pci_read_word(temp, PCI_CLASS_DEVICE);
+		if (tmp2 == devclass)
+			return temp;
+	}
+
+	return NULL;
+}
+
 static int pcidev_shutdown(void *data)
 {
 	if (pacc == NULL) {