Revert "Restrict slave mountspace so Dalvik apps can mount system-wide volumes".

No longer needed as su calls piped through the Superuser daemon run outside
zygote mountspaces.

This reverts commit de575decbb08bb4b99c2cf8ed84cf5ba6df8d9d9.
Update to MJA kernel source.
Merge MJA kernel source.
jf_spr_defconfig: Re-add from SCH-R970X MFA.

Set CONFIG_AUTHENTEC_VPNCLIENT_INTERCEPTOR=y.
Force enable exfat driver.
Update to MK2 kernel source.
Merge MK2 kernel source.