ARM: dts: msm: Update frequency to MEM ACC level mappings for MSMCOBALT

Update the CPU frequency to MEM ACC level mappings for
the gold and silver clusters on MSMCOBALT to match the
recommendations given in the voltage plan.

CRs-Fixed: 1046577
Change-Id: Ia2d375b4c9d53dc4eedaf4983dd0bd1433419d75
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>