msm: pm_boot: Modify probe method for Boot Remapper

Modify the probe method in cases where boot address is remapped during
power collapse. Allocate 8 bytes of EBI memory to store the reset vector
during the probe method instead of trying to read the boot address from
device tree file.

Change-Id: Id3049e321b881bb1cf106762e1aeb16aa8601b67
Signed-off-by: Girish Mahadevan <girishm@codeaurora.org>