soc: qcom: pil-q6v5: Update max voltage level to INT_MAX for CX rail

To support a higher GPU frequency on MSM8937 Pro target the CX rail
expects TURBO_HIGH voltage level. So changing CX max voltage level to
INT_MAX for voting purpose for mss and lpass subsystem.

Change-Id: Ic8278191a7352d1e0a339251dacd028ef5a02e95
Signed-off-by: Avaneesh Kumar Dwivedi <akdwived@codeaurora.org>