arm64: msm: Add support for uncompressed kernel image

Add support for uncompressed kernel image

[eberman@codeaurora.org: Removed dtb-related changes]
[eberman@codeaurora.org: Add extra description to Kconfig]
Change-Id: I62229187e1f3e0ec11ff4b5a31c36dcee86dc8b7
Signed-off-by: Atanas Filipov <afilipov@codeaurora.org>
Signed-off-by: Rishabh Bhatnagar <rishabhb@codeaurora.org>
Signed-off-by: Elliot Berman <eberman@codeaurora.org>