ANDROID: arm64: kaslr: fixup Falkor workaround for 4.9

android-4.9 port of upstream commit
6c27c408
"arm64: kaslr: Put kernel vectors address in separate data page"
failed to fixup code that does not omcpile when CONFIG_RANDOMIZE_BASE=y.

Port fixup for earlier kernels from ghackmann@google.com to
android-4.9:
  - replace ARM64_WORKAROUND_QCOM_FALKOR_E1003 alternative with
     compile-time CONFIG_ARCH_MSM8996 check]

Change-Id: Idc4bb255db830029093ea0d948a9e5066e2c13f8
Signed-off-by: Greg Hackmann <ghackmann@google.com>
Signed-off-by: Todd Poynor <toddpoynor@google.com>