clk: qcom: Add header file for branch clock memory flags

The branch clock memory flags would be required by clients to be
able to set the peripheral and core memory bits of these clocks.
Move the flags to a new header file.

Change-Id: Idcfdcdb967605959e76faaac7e28363b71bceb36
Signed-off-by: Taniya Das <tdas@codeaurora.org>
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>