config: revert options initially selected by EXT4_ENCRYPTION
EXT4_ENCRYPTION was initially a bool, which caused anything
selected by it to be selected as =y even if EXT4 was =m.
We can restore the following options back to being modular:
- CRYPTO_CTS
- CRYPTO_ECB
- CRYPTO_GF128MUL
- CRYPTO_XTS
Other crypto-related options enabled in the v4.1-rc1 update are
a result of INTEGRITY=y and can't be returned to modular options
without also disabling INTEGRITY.