Switch back to mksh as the default
Switch back to mksh as the default

Change-Id: I4f39e8d8cc22520cd36f83f8675a716cc1ade1d9

xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build,ND-3500/platform_manifest,fallouttester/platform_manifest,pranav01/platform_manifest,hagar006/platform_manifest,knone1/platform_manifest,Hybrid-Power/startsync,xorware/android_build,RR-msm7x30/platform_manifest,see4ri/lolili