[partition] export PartitionActions::bytesToSectors for future use

As we move some of the partition creation code away from
PartitionActions, we will need the bytesToSectors function. Rather than
copying it, we export it in the PartitionActions namespace, so that
other classes can use it.

Signed-off-by: Arnaud Ferraris <arnaud.ferraris@collabora.com>

src/modules/partition/core/PartitionActions.cpp

@@ -90,7 +90,7 @@ alignBytesToBlockSize( qint64 bytes, qint64 blocksize )
     return blocks * blocksize;
 }
 
-constexpr qint64
+qint64
 bytesToSectors( qint64 bytes, qint64 blocksize )
 {
     return alignBytesToBlockSize( alignBytesToBlockSize( bytes, blocksize), MiBtoBytes(1) ) / blocksize;