mb/google/nissa/var/nivviks,yaviks: Remove ISH firmware-name

For nissa, the ISH main firmware will be included in the CSE region in
flash instead of loading it from rootfs. So remove the ISH
firmware-name.

BUG=b:234776154
TEST=Boot to OS on nirwen and yaviks UFS SKUs. Check ISH firmware is not
loaded by kernel, and device still goes to S0i3.

Cq-Depend: chrome-internal:5102230
Change-Id: I68f963e17bc0dbf9db9adaaa3f96f06b8737523b
Signed-off-by: Reka Norman <rekanorman@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69868
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kangheui Won <khwon@chromium.org>
diff --git a/src/mainboard/google/brya/variants/nivviks/overridetree.cb b/src/mainboard/google/brya/variants/nivviks/overridetree.cb
index 9567d4f..76fe43e 100644
--- a/src/mainboard/google/brya/variants/nivviks/overridetree.cb
+++ b/src/mainboard/google/brya/variants/nivviks/overridetree.cb
@@ -519,10 +519,6 @@
 			probe STORAGE STORAGE_EMMC
 		end
 		device ref ish on
-			chip drivers/intel/ish
-				register "firmware_name" = ""adl_ish_lite.bin""
-				device generic 0 on end
-			end
 			probe STORAGE STORAGE_UFS
 		end
 		device ref ufs on
diff --git a/src/mainboard/google/brya/variants/yaviks/overridetree.cb b/src/mainboard/google/brya/variants/yaviks/overridetree.cb
index c3b98b5..6b57ada 100644
--- a/src/mainboard/google/brya/variants/yaviks/overridetree.cb
+++ b/src/mainboard/google/brya/variants/yaviks/overridetree.cb
@@ -212,12 +212,7 @@
 			end
 		end
 		device ref emmc on end
-		device ref ish on
-			chip drivers/intel/ish
-				register "firmware_name" = ""adl_ish_lite.bin""
-				device generic 0 on end
-			end
-		end
+		device ref ish on end
 		device ref ufs on end
 		device ref pch_espi on
 			chip ec/google/chromeec