defconfig: enable CONFIG_HW_RANDOM_MSM_LEGACY for msm8909

Observing issue where random: crng init happens very late
during kernel boot up and user space processes are blocked.
That makes total boot time significantly higher. Enabling
this config makes boot up to happen normally.

Change-Id: I8059d7eafe50ad2db541716a2c221889270072a7
Signed-off-by: Pranav Patel <pranavp@codeaurora.org>