radio: return the predefined value in RadioSim::getAllowedCarriers

to make the test happy. This matches the
previous implementation.

Bug: 438467932
Test: atest VtsHalRadioTargetTest
Change-Id: I79dc9a9d2a2845a7ab991d5d1b1210bae3f8ef04
Signed-off-by: Roman Kiryanov <rkir@google.com>
1 file changed