soc: qcom: use MODULES_END instead of KIMAGE_VADDR

Because of KIMAGE_VADDR is not defined by ARM32, so in order to
support minidump function on ARM32, so use MODULES_END instead
of KIMAGE_VADDR, because MODULES_END are defined by ARM64 and
ARM32.

Change-Id: Ie0d990baa17a207ceb7ed56faa9b5256f31a3e17
Signed-off-by: Tengfei Fan <tengfeif@codeaurora.org>