mm: fix dead loop if signal pending for cma alloc task [1/1]

mm: fix dead loop if signal pending for cma alloc task [1/1]

PD#GH-17

Problem:
If a task be killed during CMA allocation, then it will abort
cma allocation in function compact_unlock_should_abort. But in
function aml_cma_alloc_range, it will return -EBUSY. Which cause
cma allocation loop won't exit and run again and again.

Solution:
return -EINT for this case to exit cma allocaion loop.

Verify:
newman platform

Change-Id: I6559bb184fc035ae68c8ccd001407767e1e22f0c
Signed-off-by: Tao Zeng <tao.zeng@amlogic.com>