Revert "mb/google/var/trulo: Fix ISH firmare name"

This reverts commit 2da8d8affc.

Reason: The ISH firmware is renamed to trulo_ish.bin in the rootfs
itself hence this change is not required.

BUG=b:401138236
TEST=S0ix on Trulo and Truloti.

Change-Id: Ic21c9e2a28113dbd58ac992a380df601d058b16c
Signed-off-by: Kapil Porwal <kapilporwal@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/86976
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Dinesh Gehlot <digehlot@google.com>
Reviewed-by: Jayvik Desai <jayvik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/brya/variants/baseboard/trulo/devicetree.cb

@@ -91,7 +91,7 @@ chip soc/intel/alderlake
 		device ref tcss_xhci on end
 		device ref ish on
 			chip drivers/intel/ish
-				register "firmware_name" = ""trulo-ish.bin""
+				register "firmware_name" = ""trulo_ish.bin""
 				register "add_acpi_dma_property" = "true"
 				device generic 0 on end
 			end