MAINTAINERS: altera-sysmgr: Fix typo in a filepath

Fix typo (s/sysgmr/sysmgr/) in the header filepath.

Fixes: f36e789a ("mfd: altera-sysmgr: Add SOCFPGA System Manager")
Signed-off-by: Denis Efremov <efremov@linux.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

MAINTAINERS

@@ -723,7 +723,7 @@ ALTERA SYSTEM MANAGER DRIVER
 M:	Thor Thayer <thor.thayer@linux.intel.com>
 S:	Maintained
 F:	drivers/mfd/altera-sysmgr.c
-F:	include/linux/mfd/altera-sysgmr.h
+F:	include/linux/mfd/altera-sysmgr.h
 
 ALTERA SYSTEM RESOURCE DRIVER FOR ARRIA10 DEVKIT
 M:	Thor Thayer <thor.thayer@linux.intel.com>