soc/intel: Replace bad uses of `find_resource`

The `find_resource` function will never return null (will die instead).
In cases where the existing code already accounts for null pointers, it
is better to use `probe_resource` instead, which returns a null pointer
instead of dying.

Change-Id: I2a57ea1c2f5b156afd0724829e5b1880246f351f
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58907
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
diff --git a/src/soc/intel/broadwell/gma.c b/src/soc/intel/broadwell/gma.c
index b3e010c..e84d075 100644
--- a/src/soc/intel/broadwell/gma.c
+++ b/src/soc/intel/broadwell/gma.c
@@ -505,7 +505,7 @@
 
 	intel_gma_init_igd_opregion();
 
-	gtt_res = find_resource(dev, PCI_BASE_ADDRESS_0);
+	gtt_res = probe_resource(dev, PCI_BASE_ADDRESS_0);
 	if (!gtt_res || !gtt_res->base)
 		return;