lpm_levels_legacy: Rectified compilation errors

Compilation failed, due to updated function declarations lpm_levels
driver where the lpm_levels_legacy driver is not updated in parallel
Rectified all errors occurred during compilation for mdm9607 target.

Change-Id: Iacb6ce9949454a949bcba90a8e8285ca18b832d5
Signed-off-by: Raghavendra Kakarla <rkakarla@codeaurora.org>
Signed-off-by: Sivasri Kumar Vanka <sivasri@codeaurora.org>
Signed-off-by: Haribabu Gattem <haribabu@codeaurora.org>
Signed-off-by: Tushar Nimkar <tnimkar@codeaurora.org>