Increase stack size a bit to silence warning
Increase stack size a bit to silence warning

ext-partition needs a slightly bigger stack.

Change-Id: Ib727cfd5b3526b18d8c7306ddb33a490bb885834

smarter/aom,smarter/aom,luctrudeau/aom,luctrudeau/aom,smarter/aom,luctrudeau/aom,GrokImageCompression/aom,smarter/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,smarter/aom,smarter/aom,luctrudeau/aom,GrokImageCompression/aom,GrokImageCompression/aom,luctrudeau/aom,luctrudeau/aom