tegra: linsim removal

tegra: linsim removal

Removed multiple tegra_platform_is_linsim if statements and
removed tegra_platform_is_linsim function definition because of
linsim deprecation.

Bug 1903831

Change-Id: Id0a7e5d6d133ff1897fe5ad1389d22fb02187828
Signed-off-by: William Pierce <wpierce@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1485003
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
(cherry picked from commit 6cecfaad8a31de9e9e330f73ce460667cac00a2a)