libs/utils/android: ensure Jankbench is executed while in AIRPLANE mode
libs/utils/android: ensure Jankbench is executed while in AIRPLANE mode

We do not need WiFi connectivity while Jankbench runs thus, to have more
stable measurements for energy consumption, let's enabled AIRPLANE mode
before starting the test.

Signed-off-by: Patrick Bellasi <431c86f368affbc3148c4669fbd465131f7e82cb@arm.com>

joelagnel/lisa,ARM-software/lisa,mdigiorgio/lisa,ARM-software/lisa,credp/lisa,bjackman/lisa,ARM-software/lisa,arnoldlu/lisa,ARM-software/lisa,joelagnel/lisa,JaviMerino/lisa,credp/lisa,credp/lisa,mdigiorgio/lisa,arnoldlu/lisa,credp/lisa,bjackman/lisa