msm: acpuclock-8226: Remove requests for VDD_MX

The cpr-regulator driver will make VDD_MX requests on behalf of acpuclock
since there exists a relationship between VDD_MX and VDD_APCS levels that
needs to be satisfied.

Change-Id: Id6bf9eceb2419e1541814ad93448a65fe4445a4b
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>