mb/google/brya/var/marasov: Remove ISH firmware-name

For marasov, 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.

TEST=Boot to OS on Marasov UFS SKUs. Check ISH firmware is not
loaded by kernel, and device still goes to S0i3.

Change-Id: I278e5d403ef9515e538a527f43949e505d750bb1
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71261
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kyle Lin <kylelinck@google.com>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Jamie Chen <jamie.chen@intel.com>

src/mainboard/google/brya/variants/marasov/overridetree.cb

@@ -206,10 +206,6 @@ chip soc/intel/alderlake
 			probe STORAGE STORAGE_NVME
 		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