Description: mm: cma: fix incorrect type conversion for size during dma allocation
References:
 https://bugzilla.redhat.com/show_bug.cgi?id=1489088
 https://source.android.com/security/bulletin/2017-09-01
Notes:
Bugs:
upstream: released (4.3-rc7) [67a2e213e7e937c41c52ab5bc46bf3f4de469f6e]
4.19-upstream-stable: N/A "Fixed before branch point"
4.9-upstream-stable: N/A "Fixed before branching point"
3.16-upstream-stable: released (3.16.64) [cc12c0099168b416f6c3eff1cd560a771f4b7c3f]
sid: released (4.3.1-1)
4.9-stretch-security: N/A "Fixed before branching point"
3.16-jessie-security: ignored "CMA is not enabled in any configuration"