Revert "config: enable bcache for x86 by default"

driver inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I6N4EP


CVE: NA

--------------------------------

This reverts commit fc3bfef5.

This commit causes the interface to change.

Fixes: fc3bfef5 ("config: enable bcache for x86 by default")
Signed-off-by: Chao Zhu <tom_toworld@163.com>