Revert "drivers: modem_if: don't wait_enumeration in if_usb_disconnect for P4LTE"

This reverts commit e0c09f5e7fdba7b128b0b9e3ffb6a15f2df6ffa6.
drivers: modem_if: omit cbp71_force_crash_exit for P4LTE

-set STATE_CRASH_EXIT if disconnected and not enumerated for some time.
lowmemorykiller: Compact memory when killing processes

* Memory compaction is never invoked on Android because we avoid swap
   and don't allocate huge pages. Fix it by invoking compaction from the LMK when
   a process is killed to reduce memory fragmentation.

Change-Id: I2bda790c2093e65fd6f43d52ea5149d6b57cb1e9

Conflicts:

	drivers/staging/android/lowmemorykiller.c
lowmemorykiller: Use asynchronous compaction

Change-Id: I6a65d06fc30b88fcedaaf1abf1855fdd19e3c912
drivers: staging: android: lmk compile fixup

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>