ARM: dts: msm: Update proper KTM cpu mask dt node for msm8939 v3

KTM uses cpu mask for cores which support cpu frequency/cpu hotplug
instead of cpu phandles. Use proper KTM cpu mask dt node for
msm8939 v3.

Change-Id: Idf01afd04ad8cfc6ee692bbaaf7f09024c1e5010
Signed-off-by: Manaf Meethalavalappu Pallikunhi <manafm@codeaurora.org>
Signed-off-by: Sridhar Gujje <sgujje@codeaurora.org>
Signed-off-by: Bharat Pawar <bpawar@codeaurora.org>
Signed-off-by: Nirmal Abraham <nabrah@codeaurora.org>