usbboot: Update and simplify .gitignore

Use anchored filenames and wildcards to make it easier to keep the
.gitignore file up to date with future code changes.

The entries are more precise now:

 * ‘git add .’ will not start tracking the src/usbboot binary
 * ‘git ls-files -i --exclude-standard’ will not list
   xburst_stage1/Makefile and xburst_stage2/Makefile as mistakenly
   tracked.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>

usbboot/.gitignore

@@ -1,11 +1,22 @@
-Makefile
+/aclocal.m4
+/config.h
+/config.h.in
+/config.log
+/config.status
+/configure
+/stamp-h1
+/m4/
+/autom4te.cache/
+
 Makefile.in
-aclocal.m4
-config.h
-config.h.in
-config.log
-config.status
-configure
-stamp-h1
-m4
-autom4te.cache
+
+/Makefile
+/src/Makefile
+
+*.lst
+*.o
+*.bin
+*.dump
+*.elf
+*.map
+*.sym

usbboot/src/.gitignore

@@ -1,8 +1,3 @@
-.deps
-cmd.o
-command_line.o
-inflash
-inflash_version.h
-ingenic_cfg.o
-ingenic_usb.o
-main.o
+/.deps/
+/*_version.h
+/usbboot

usbboot/xburst_stage1/.gitignore

@@ -1,11 +0,0 @@
-System.map
-board_4740.o
-board_4750.o
-common.o
-debug.o
-head.o
-main.o
-xburst_stage1.bin
-xburst_stage1.dump
-xburst_stage1.elf
-xburst_stage1.map

usbboot/xburst_stage2/.gitignore

@@ -1,21 +0,0 @@
-boothandler.lst
-boothandler.o
-cache.lst
-cache.o
-head.lst
-head.o
-main.lst
-main.o
-nandflash_4740.lst
-nandflash_4740.o
-nandflash_4750.lst
-nandflash_4750.o
-serial.lst
-serial.o
-udc.lst
-udc.o
-xburst_stage2.bin
-xburst_stage2.dump
-xburst_stage2.elf
-xburst_stage2.map
-xburst_stage2.sym