programmer: Smoothen register_opaque_master() API

It was impossible to register a const struct opaque_master that would
point to dynamically allocated `data`. Fix that so that we won't
have to create more mutable globals.

Change-Id: Id3adb4cf04ae04dbe87ddb96f30871cb5f7c8ff0
Signed-off-by: Anastasia Klimchuk <aklm@chromium.org>
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/54170
Original-Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Original-Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/72202
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/nicintel_eeprom.c b/nicintel_eeprom.c
index 0b20290..33c0b0f 100644
--- a/nicintel_eeprom.c
+++ b/nicintel_eeprom.c
@@ -490,7 +490,7 @@
 				return 1;
 		}
 
-		return register_opaque_master(&opaque_master_nicintel_ee_82580);
+		return register_opaque_master(&opaque_master_nicintel_ee_82580, NULL);
 	} else {
 		nicintel_eebar = rphysmap("Intel i210 NIC w/ emulated EEPROM",
 					  io_base_addr + 0x12000, MEMMAP_SIZE);
@@ -500,7 +500,7 @@
 		if (register_shutdown(nicintel_ee_shutdown_i210, NULL))
 			return 1;
 
-		return register_opaque_master(&opaque_master_nicintel_ee_i210);
+		return register_opaque_master(&opaque_master_nicintel_ee_i210, NULL);
 	}
 
 	return 1;