msm-poweroff: Disable ramdump

[1][FP4-2872] disable ramdump
 ###%%%comment:disable ramdump
 ###%%%bug number:FP4-2872
 ###%%%product name:sm7225_r_fp4
 ###%%%root cause:Coding
 ###%%%Bug category:T2M
 ###%%%Module_Impact:kernel
 ###%%%Test_Suggestion:check ramdump
 ###%%%Solution:modify
 ###%%%Test_Report:pass
 ###%%%VAL Can Test:no

Change-Id: Ife184a875a5c48baeaab63da4425a4db7033f3e4