gitignore: Fix for poky repository

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

.gitignore

@@ -1,4 +1,3 @@
-bitbake
 *.pyc
 *.pyo
 /*.patch
@@ -9,10 +8,10 @@ scripts/oe-git-proxy-socks
 sources/
 meta-*
 !meta-skeleton
-!meta-demoapps
+!meta-hob
 *.swp
 *.orig
 *.rej
 *~
-
-
+!meta-yocto
+!meta-yocto-bsp