build-all.py: Add support for msmkrypton_defconfig

There is an msmkrypton_defconfig which does not match the
existing msm pattern by virtue of not containing a number
after the 'msm' prefix. Compile it too.

Change-Id: I19535afe7912487cb6882adec89e3fd8138ed904
Signed-off-by: Abhimanyu Kapur <abhimany@codeaurora.org>