Enforce dependency of dma heap driver on SCM driver
without which it will not work and this is in
the preparation of adding interconnect voting
in SCM node which if it gets added without this
change dma heap driver can result in NULL pointer
issue.
Change-Id: I654e69398643b2e78d180c7167b29b62e7914f77
Signed-off-by: Mukesh Ojha <quic_mojha@quicinc.com>