arm64: configs: tegra: Build CAN drivers as LKMs

arm64: configs: tegra: Build CAN drivers as LKMs

The following configs are enabled to support CAN:
  CONFIG_CAN
  CONFIG_CAN_VCAN
  CONFIG_CAN_SLCAN
  CONFIG_CAN_PEAK_PCIEFD
  CONFIG_MTTCAN
  CONFIG_TEGRA_HV_SECCAN

However, not all platforms would need CAN support, especially both
MTTCAN and TEGRA_HV_SECCAN depend on ARCH_TEGRA_18x_SOC, so these
could be just skipped for older SoCs, e.g. ARCH_TEGRA_210_SOC.

This patch changes all CAN configs to =m to build them as LKMs.

Bug 200428570
Bug 2284925

Change-Id: If6899fac19876b84adec70c64657441163de111b
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1820605
(cherry picked from commit fb39a231b428699d4a62c329fdc2bca455908dbb)
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1933435
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>