nios2: Update neek devicetree with new Temprei image

Some peripherals got removed from the new image, and the
network controller is now Altera TSE compatible.

Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
nios2: Update defconfig for new Temprei image

Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
nios2: kernel: Fix MMU initialization

mmu_init() uses the cpuinfo struct to gather MMU geometry,
thus we can only call it once such struct is ready.

Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
nios2: kernel: Define tmp to remove a warning

Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
nios2: kernel: Use safer GET_THREAD_INFO in syscall trace check

In the low-level syscall handler, the assembler implementation to
obtain the current thread_info is not correct. Fix it by using
GET_THREAD_INFO macro, as done elsewhere in this file.

Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>