Revert "Disable excessive dalvik debug messages"

This reverts commit 1f2a3d42ca7713533a39930299e9d155a73cca5f.

Change-Id: Id3d8c92698d3874e15234d321a7bb1405041b7cf
Merge "Revert "Disable excessive dalvik debug messages"" into cm-10.2
No need to override mkshrc as it no longer exports PS1

busybox sh works fine with the one in android_external_mksh

Change-Id: I09ae2d16837053ea0be50d3320eccf47057e25c1
Merge remote-tracking branch 'cm/cm-10.2' into cm-10.2