MAINTAINERS: Add Eric Snowberg as a reviewer to IMA

Digital signature based IMA-appraisal relies heavily on kernel keyrings.
Eric Snowberg has been involved in adding the machine keyring to allow
the system owner to add their own keys.  With this addition,
IMA-appraisal usage can be extended to allow loading local and 3rd party
software keys onto the IMA keyring.

Add Eric as a reviewer.
Acked-by: Eric Snowberg <eric.snowberg@oracle.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>

MAINTAINERS

@@ -10557,6 +10557,7 @@ INTEGRITY MEASUREMENT ARCHITECTURE (IMA)
 M:	Mimi Zohar <zohar@linux.ibm.com>
 M:	Roberto Sassu <roberto.sassu@huawei.com>
 M:	Dmitry Kasatkin <dmitry.kasatkin@gmail.com>
+R:	Eric Snowberg <eric.snowberg@oracle.com>
 L:	linux-integrity@vger.kernel.org
 S:	Supported
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity.git