ima: move full pathname resolution to separate function

Define a new function ima_d_path(), which returns the full pathname.
This function will be used further, for example, by the directory
verification code.

Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>

diff --cc security/integrity/ima/ima.h
Simple merge

diff --cc security/integrity/ima/ima_api.c
Simple merge

diff --cc security/integrity/ima/ima_main.c
Simple merge