Makefile.mk: Include build/dsdt.d at the same time as DEPENDENCIES

Instead of including the dependency file generated in asl_template when
the template is evaluated, add it to the DEPENDENCIES variable so that
it is included at the same time as the rest of the .d files the top
level Makefile. This should be safe since asl_template is evaluated
while calling includemakefiles, which is occurs before the files in
DEPENDENCIES are included.

TEST:
1. Build dell/e6400
2. Run `touch src/mainboard/dell/e6400/dsdt.asl` (defined as a
   prerequisite of build/dsdt.aml in build/dsdt.d)
3. Run `make --debug=b`
4. Verify that dsdt.aml was rebuilt due dsdt.asl being newer than target

Change-Id: Ie8271d1e172395917f2859c8bbfd2041ddc572ca
Signed-off-by: Nicholas Chin <nic.c3.14@gmail.com>
---
M Makefile.mk
1 file changed, 1 insertion(+), 1 deletion(-)