membuff: Rename the files to membuf

Rename the C and header files to use the membuf basename, to match the
functions.

Add a MAINTAINERS entry while we are here.

Signed-off-by: Simon Glass <sjg@chromium.org>

MAINTAINERS

@@ -1266,6 +1266,13 @@ T:	git git://github.com/ARM-software/u-boot.git
 F:	drivers/video/mali_dp.c
 F:	drivers/i2c/i2c-versatile.c
 
+MEMBUF
+M:	Simon Glass <sjg@chromium.org>
+S:	Maintained
+T:	git https://source.denx.de/u-boot/u-boot.git
+F:	include/membuf.h
+F:	lib/membuf.c
+
 MICROBLAZE
 M:	Michal Simek <monstr@monstr.eu>
 S:	Maintained

include/asm-generic/global_data.h

@@ -23,7 +23,7 @@
 #include <board_f.h>
 #include <event_internal.h>
 #include <fdtdec.h>
-#include <membuff.h>
+#include <membuf.h>
 #include <linux/list.h>
 #include <linux/build_bug.h>
 #include <asm-offsets.h>

lib/Makefile

@@ -128,7 +128,7 @@ obj-y += hang.o
 obj-y += linux_compat.o
 obj-y += linux_string.o
 obj-$(CONFIG_$(PHASE_)LMB) += lmb.o
-obj-y += membuff.o
+obj-y += membuf.o
 obj-$(CONFIG_REGEX) += slre.o
 obj-y += string.o
 obj-y += tables_csum.o

lib/membuf.c

@@ -9,7 +9,7 @@
 #include <errno.h>
 #include <log.h>
 #include <malloc.h>
-#include "membuff.h"
+#include "membuf.h"
 
 void membuf_purge(struct membuff *mb)
 {