Fastbootd does not require read access to system and boot partitions

Bug: 78793464
Test: fastboot flashall

Change-Id: I5b65b818dc43a01f90a38202e3a1b810fef70ca8

public/fastbootd.te

@@ -39,8 +39,12 @@ recovery_only(`
   allow fastbootd dm_device:blk_file rw_file_perms;
 
   allow fastbootd super_block_device:blk_file rw_file_perms;
-  allow fastbootd system_block_device:blk_file rw_file_perms;
-  allow fastbootd boot_block_device:blk_file rw_file_perms;
+  allow fastbootd system_block_device:blk_file { w_file_perms ioctl };
+  allowxperm fastbootd system_block_device:blk_file ioctl { BLKGETSIZE64 };
+
+
+  allow fastbootd boot_block_device:blk_file { w_file_perms ioctl };
+  allowxperm fastbootd boot_block_device:blk_file ioctl { BLKGETSIZE64 };
 
   allow fastbootd misc_block_device:blk_file rw_file_perms;