MAINTAINERS/OWNERS: Transfer from venture@ to brandonkim@

Patrick Venture has not been actively working on OpenBMC and seeing
as how this repository is only pulled in by phosphor-ipmi-flash, we
agreed that I (as a maintainer of that repository) would be a good
replacement.

Patrick will resign his maintainership while I will take over.
The plan is to ask and see if other phosphor-ipmi-flash maintainers
would also like to join the maintainer / owner / reviewer role.

Signed-off-by: Brandon Kim <brandonkim@google.com>
Change-Id: I8c676963d617f7fb1789bc485bc24d0f41cf0b89
diff --git a/MAINTAINERS b/MAINTAINERS
index b918af2..422b833 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -42,4 +42,4 @@
 START OF MAINTAINERS LIST
 -------------------------
 
-M:  Patrick Venture <venture@google.com> <venture!>
+M:  Brandon Kim <brandonkim@google.com> <brandonk!>