fix(plat/fvp): bump BL2 stack size

VERBOSE print logs need a larger stack size and the currently configured
BL2 stack size was insufficient for FVP. This patch increases the same.

Signed-off-by: Soby Mathew <soby.mathew@arm.com>
Change-Id: I316ba2ea467571161b5f4807e6e5fa0bf89d44c6
1 file changed