MAINTAINERS: update two greybus sections

Fix a file entry typo and drop the obsolete timesync entries, which were
all caught by:

	scripts/get_maintainer.pl --self-test=patterns
Reported-by: Joe Perches <joe@perches.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

MAINTAINERS

@@ -6161,7 +6161,7 @@ F:	drivers/staging/greybus/bootrom.c
 F:	drivers/staging/greybus/firmware.h
 F:	drivers/staging/greybus/fw-core.c
 F:	drivers/staging/greybus/fw-download.c
-F:	drivers/staging/greybus/fw-managament.c
+F:	drivers/staging/greybus/fw-management.c
 F:	drivers/staging/greybus/greybus_authentication.h
 F:	drivers/staging/greybus/greybus_firmware.h
 F:	drivers/staging/greybus/hid.c
@@ -6170,12 +6170,10 @@ F:	drivers/staging/greybus/spi.c
 F:	drivers/staging/greybus/spilib.c
 F:	drivers/staging/greybus/spilib.h
 
-GREYBUS LOOPBACK/TIME PROTOCOLS DRIVERS
+GREYBUS LOOPBACK DRIVER
 M:	Bryan O'Donoghue <pure.logic@nexus-software.ie>
 S:	Maintained
 F:	drivers/staging/greybus/loopback.c
-F:	drivers/staging/greybus/timesync.c
-F:	drivers/staging/greybus/timesync_platform.c
 
 GREYBUS PLATFORM DRIVERS
 M:	Vaibhav Hiremath <hvaibhav.linux@gmail.com>