MAINTAINERS: IPQ40XX: remove Luka Kovacic as maintainer

Luka Kovacic is no longer at Sartura, so remove him as one of IPQ40xx
maintainers.

Signed-off-by: Robert Marko <robert.marko@sartura.hr>
diff --git a/MAINTAINERS b/MAINTAINERS
index 6b32a6d..2a0f240 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -334,7 +334,6 @@
 
 ARM IPQ40XX
 M:	Robert Marko <robert.marko@sartura.hr>
-M:	Luka Kovacic <luka.kovacic@sartura.hr>
 M:	Luka Perkov <luka.perkov@sartura.hr>
 S:	Maintained
 F:	arch/arm/mach-ipq40xx/