Revert "defconfig: msm: Enable mass storage support for APQ8009"

This reverts commit 36f517a8.
This is to revert USB mass storage config to resolve boot issue 
observed on SOM target.

Change-Id: I2971da437e00696524034494274abe7326b297ae
Signed-off-by: Chinkit Kumar,Kirti Kumar Parmar <parma@codeaurora.org>