Do not clobber existing BOARD_SEPOLICY_DIRS

Append to the BOARD_SEPOLICY_DIRS variable to remain consistant with
other device BoardConfigs.

An issue was observed when creating a derived device which made use
of the BoardConfigCommon.mk file in the BoardConfig chain.

This resulting in very "weird" behaviour when the device was booted
Most apperent was wifi scan returned no networks and wps connections
would instantly disconnect after making a succesfull coonection

Test: sepolicy is intact

Use the following derived device repository to make an hikeytv-eng
system image

git clone https://github.com/trevd/android_device_linaro_hikeytv \
device/linaro/hikeytv

Observe wifi scanning issues

create image with change applied

The wifi scanning should function as normal

Change-Id: I068c2282556dadf812eee75940aad5f2192a2eb2
Signed-off-by: Trevor Drake <trevd1234@gmail.com>
1 file changed