tegra132: No need for Kconfig variables for stacks

tegra132: No need for Kconfig variables for stacks

With the latest changes to include stack storage within ramstage, we no longer
need to define Kconfig options for ramstage/exception stacks in arm64.

BUG=None
BRANCH=None
TEST=Compiles successfully and boots to kernel on ryu

Change-Id: I7361d8f567453e775240151fd1180c49025141b3
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 9aaa89115a67606fcb66eb354741043f7f2094bf
Original-Change-Id: I93c23ac3fa9adab4eac3c739023cbae3e5135497
Original-Signed-off-by: Furquan Shaikh <furquan@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/214607
Original-Tested-by: Furquan Shaikh <furquan@chromium.org>
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Original-Commit-Queue: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: http://review.coreboot.org/9023
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>