dragonboard: Also label boot partition with boot_block_device.
As we're still using boot_control_copy, update_engine needs to be able
to write to the 'boot' partition when copying from either 'boot_a' or
'boot_b'. This didn't work because we had only labeled 'boot_a' and
'boot_b', not 'boot. This CL fixed that.
Bug: 23186405
Change-Id: I0216562fa891e28168b08f2d4839d35bad107d19
Test: Manually tested.
diff --git a/sepolicy/file_contexts b/sepolicy/file_contexts
index 20b4675..e72bd56 100644
--- a/sepolicy/file_contexts
+++ b/sepolicy/file_contexts
@@ -1,3 +1,4 @@
+/dev/block/platform/soc\.0/7824900\.sdhci/by-name/boot u:object_r:boot_block_device:s0
/dev/block/platform/soc\.0/7824900\.sdhci/by-name/misc u:object_r:misc_block_device:s0
/dev/block/platform/soc\.0/7824900\.sdhci/by-name/boot_a u:object_r:boot_block_device:s0
/dev/block/platform/soc\.0/7824900\.sdhci/by-name/system_a u:object_r:system_block_device:s0
