disk_system add-ons: fix initialization

We never told the disk system that the partition had been initialized.
As a result, the disk device jobs to clean and reinit the partition
table were not run. This would lead to:
- The bootloader code not being replaced with our MBR code
- Old partitions not being removed from the disk

This would maybe solve itself when creating a partition, but it's better
to do these changes immediately when the user asks to initialize the
disk.

Fixes #9108.

Change-Id: Icc8ebe3830d948367852a57cf46d034b0f1c6c19
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3673
Reviewed-by: Niels Sascha Reedijk <niels.reedijk@gmail.com>

src/add-ons/disk_systems/gpt/GPTDiskAddOn.cpp

@@ -139,6 +139,7 @@ GPTDiskAddOn::Initialize(BMutablePartition* partition, const char* name,
 	partition->SetContentParameters(NULL);
 	partition->SetContentSize(
 		round_down(partition->Size(), partition->BlockSize()));
+	partition->Changed(B_PARTITION_CHANGED_INITIALIZATION);
 
 	*_handle = handle;
 	return B_OK;

src/add-ons/disk_systems/intel/ExtendedPartitionAddOn.cpp

@@ -141,6 +141,7 @@ ExtendedPartitionAddOn::Initialize(BMutablePartition* partition,
 	partition->SetContentParameters(NULL);
 	partition->SetContentSize(
 		sector_align(partition->Size(), partition->BlockSize()));
+	partition->Changed(B_PARTITION_CHANGED_INITIALIZATION);
 
 	*_handle = handleDeleter.Detach();
 

src/add-ons/disk_systems/intel/PartitionMapAddOn.cpp

@@ -140,6 +140,7 @@ PartitionMapAddOn::Initialize(BMutablePartition* partition, const char* name,
 	partition->SetContentParameters(NULL);
 	partition->SetContentSize(
 		sector_align(partition->Size(), partition->BlockSize()));
+	partition->Changed(B_PARTITION_CHANGED_INITIALIZATION);
 
 	*_handle = handleDeleter.Detach();