core: move fs-related C files into fs/

Move filesystem-related C files into the fs/ directory.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

diff --git a/core/cache.c b/core/fs/cache.c
similarity index 100%
rename from core/cache.c
rename to core/fs/cache.c

diff --git a/core/chdir.c b/core/fs/chdir.c
similarity index 100%
rename from core/chdir.c
rename to core/fs/chdir.c

diff --git a/core/diskio.c b/core/fs/diskio.c
similarity index 100%
rename from core/diskio.c
rename to core/fs/diskio.c

diff --git a/core/fs.c b/core/fs/fs.c
similarity index 100%
rename from core/fs.c
rename to core/fs/fs.c

diff --git a/core/newconfig.c b/core/fs/newconfig.c
similarity index 100%
rename from core/newconfig.c
rename to core/fs/newconfig.c

diff --git a/core/readdir.c b/core/fs/readdir.c
similarity index 100%
rename from core/readdir.c
rename to core/fs/readdir.c