[9610] wlbt: Fix compilation error in mxlog_transport.c (Android P)

[9610] wlbt: Fix compilation error in mxlog_transport.c (Android P)

rivers/misc/samsung/scsc/mxlog_transport.c: In function 'mxlog_thread_start':
drivers/misc/samsung/scsc/mxlog_transport.c:223:2: error: implicit declaration of function 'get_task_struct' [-Werror=implicit-function-declaration]
  get_task_struct(th->task);
  ^
drivers/misc/samsung/scsc/mxlog_transport.c:231:3: error: implicit declaration of function 'put_task_struct' [-Werror=implicit-function-declaration]
   put_task_struct(th->task);
   ^
cc1: some warnings being treated as errors
scripts/Makefile.build:328: recipe for target 'drivers/misc/samsung/scsc/mxlog_transport.o' failed

Change-Id: I58fe04f22b907608e03938440a0148b94d23db14
SCSC-Bug-Id: SSB-40175
Signed-off-by: Tarun Karela <t.karela@samsung.com>