[msm7630_surf] Add code to support lpddr2 surf

Detect LPDDR1 v/s LPDDR2 based on information from shared memory and
construct memory atags for kernel accordingly

Memory map differences:
LPDDR1 config has 195M contigious memory allocated to Linux kernel
LPDDR2 config has two blocks -- 123M+72M allocated to Linux kernel
1 file changed