.gitignore: ignore misc include, simple-bin, and tools/generated build artifacts

make rock5b-rk3588_defconfig
make
git status

before
~~~~~~~
On branch master
Your branch is ahead of 'origin/master' by 1 commit.
  (use "git push" to publish your local commits)

Untracked files:
  (use "git add <file>..." to include in what will be committed)
	include/autoconf.mk
	include/autoconf.mk.dep
	include/config.h
	mkimage-in-simple-bin-spi.mkimage-rockchip-tpl
	mkimage-in-simple-bin-spi.mkimage-u-boot-spl
	mkimage-in-simple-bin.mkimage-rockchip-tpl
	mkimage-in-simple-bin.mkimage-u-boot-spl
	simple-bin-spi.map
	simple-bin.fit.fit
	simple-bin.fit.itb
	simple-bin.map
	tools/generated/

after
~~~~~~~
On branch master
Your branch is ahead of 'origin/master' by 1 commit.
  (use "git push" to publish your local commits)

nothing to commit, working tree clean

Signed-off-by: John Clark <inindev@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

.gitignore

@@ -44,8 +44,10 @@ fit-dtb.blob*
 /MLO*
 /SPL*
 /System.map
-/u-boot*
 /boards.cfg
+/mkimage-in-simple-bin*
+/simple-bin*
+/u-boot*
 /*.log
 
 #
@@ -59,12 +61,15 @@ fit-dtb.blob*
 # Generated files
 #
 /spl/
+/tools/generated/
 /tpl/
 /defconfig
 
 #
 # Generated include files
 #
+/include/autoconf.mk*
+/include/config.h
 /include/config/
 /include/generated/