regulator: cpr/mem-acc-regulator: Add SCM API support for arm7

MDM9x07 supports arm7 SCM API's,Add support for the same
in mem-acc and cpr-regulator.

Change-Id: I9658d367b6aa09cf41c18873f627fb4ce53f7b43
Signed-off-by: Haribabu Gattem <haribabu@codeaurora.org>
Signed-off-by: Sivasri Kumar Vanka <sivasri@codeaurora.org>