thermal: exynos: Remove unused code related to platform_data on probe()

This patch removes the unused code related to struct exynos_tmu_platform_data
because exynos_tmu_probe() don't handle the struct exynos_tmu_platform_data *pdata.

Test HW: Exynos4412 - Trats2 board

Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Eduardo Valentin <edubezval@gmail.com>
Cc: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Tested-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>