Increase logcat buffer to prevent overwriting during test.

Add logcat buffer in clearLogcat to resolve the
log information is too large and miss the received broadcast

Test: run cts -m CtsDevicePolicyManagerTestCases -t com.android.cts.devicepolicy.QuietModeHostsideTest
BUG: 198247553
Change-Id: I10492bb28303a100adf6083d599c5e7e148bfae4
1 file changed