mtd: devices: Turn on the clocks during register access

During BAM device registration, we use BAM API's in
nand driver. As qpic is one of the client to BAM, it
is the clients responsibility to make sure that qpic
clocks  are turned ON before using BAM device else it
will results in Unclocked access.

Added code to turn ON the qpic clocks before accessing
the BAM device.

Change-Id: Ie6432484e3f6d523d05f468970f53d228be67986
Signed-off-by: Pradeep P V K <ppvk@codeaurora.org>